Release Notes for Arq Backup Version 7.38.6.0

Mar 9, 2026

SHA256(Arq7.38.6.0.msi)= 3ef84ee70385e10a7939beb03407f2e74689b84c2363bb4bc042fae808415f95

Release Notes for Arq Backup Version 7.38.5.0

Mar 3, 2026

SHA256(Arq7.38.5.0.msi)= 4421bdeb38d5b1324036021c849053c8caaad5e46a3a81d65bcd80abe5a601ef

Fixed Issues

Release Notes for Arq Backup Version 7.38.4.0

Mar 3, 2026

SHA256(Arq7.38.4.0.msi)= fce1e938afe195e54315a508a1a63a2b288efffb93aced5c8df4f9092b244701

Fixed Issues

Release Notes for Arq Backup Version 7.38.0.0

Mar 2, 2026

Fixed Issues

• Fixed an issue which could prevent rollback when installation of an Arq update results in an error.
• Improved the flow for Arq Premium trial users trying to convert to a paid subscription by redirecting to the "Convert to Paid" web page rather than the new-user web page.

Release Notes for Arq Backup Version 7.36.2.0

Aug 12, 2025

SHA2-256(Arq7.36.2.0.msi)= c7ae9178ea452709d77eb2736b69f396066cc528fb0fad23a1744f6cc1d89000

Fixed Issues

• Fixed a restore issue where 'overwrite existing files' is not checked when starting the restore job, but files that exist but don't match the size of the file in the backup record are still overwritten.

Release Notes for Arq Backup Version 7.36.0.0

Aug 4, 2025

SHA2-256(Arq7.36.0.0.msi)= fbc9a5ff88fe6465f799b28b82ef4fe4855ba05c45ffe2b78c2a863251132b95

New Features

• Added built-in support for Mega's S4 cloud storage service.

Release Notes for Arq Backup Version 7.35.1.0

May 23, 2025

SHA2-256(Arq7.35.1.0.msi)= a8d30b344ed241de7299fdc2949aa284d1c98e9bccd0261dc7dca1da417b24b6

Fixed Issues

• Fixed an issue where ArqAgent wouldn't allow startup for newer updates to .NET 4.7.

Release Notes for Arq Backup Version 7.35.0.0

Feb 25, 2025

SHA2-256(Arq7.35.0.0.msi)= 41a9bb97b6993b2ee0c5da7f4c5fdfa166373cdbb53ac7912b19aa034b848d01

Changes

• If the user manually renews their license via the web site and then manually installs the latest version (instead of using 'Check for Update' within the app), check for a renewed license before displaying an error that the license doesn't include the latest version.

Release Notes for Arq Backup Version 7.33.1.0

Jan 20, 2025

SHA2-256(Arq7.33.1.0.msi)= c40236f5e7b64d3d818250fb60642eea61bb0387587010036811fae922eddb23

SHA256(Arq7.33.1.0.msi)= 229c6e534d622a21decd4388f33f2b24e36b5bf629525038d4c87b7913ee2d05

Fixed Issues

• Fixed an issue which could cause Arq to report an error when communicating with Dropbox: "When performing a write operation with AllowWriteStreamBuffering set to false, you must either set ContentLength to a non-negative number or set SendChunked to true."

Release Notes for Arq Backup Version 7.33.0.0

Jan 10, 2025

SHA256(Arq7.33.0.0.msi)= f74bc2b3e86482dd1996dd779e0c37d42b43de0440138284e32e962278466570

New Features

• Added support for new Wasabi eu-west-3 region.

Release Notes for Arq Backup Version 7.32.2.0

Nov 15, 2024

SHA2-256(Arq7.32.2.0.msi)= 0fd6edfbfd886b7463cf3eab6c26f41528996f857a54891f67e202c74640912c

Fixed Issues

• Fixed an issue which caused Arq to close HTTPS connections too often instead of keeping them alive.

Release Notes for Arq Backup Version 7.32.0.0

Sep 5, 2024

SHA2-256(Arq7.32.0.0.msi)= b20e2c288f284082870bc9d9da6f27f8320334be96c9d5c18f5ae25304751297

Changes

• Added support for new Wasabi Milan (eu-south-1) region.

Release Notes for Arq Backup Version 7.31.1.0

Aug 21, 2024

Changes

• Show last backup time and next backup time in edit-backup-plan dialog, updating each time the user changes the schedule settings.

Release Notes for Arq Backup Version 7.31.0.0

Aug 15, 2024

Changes

• Modified Arq to prevent any changes to its internal database or any backup data if the license isn't compatible with the product version so that someone who accidentally installs a newer version not compatible with their license can easily switch back to the older version.

Release Notes for Arq Backup Version 7.30.3.0

Aug 1, 2024

Changes

• If you add a mount-point type reparse point as a folder to be backed up in your backup plan, Arq will traverse the reparse point and back up the contents of that volume. Reparse points within it are still backed up as reparse points (not traversed). This was added to enable backing up of volumes mounted in NTFS without a drive letter.

Release Notes for Arq Backup Version 7.30.2.0

July 29, 2024

Fixed Issues

• Fixed an issue where exporting file selections from an AWS backup plan and then importing them to a non-AWS backup plan could result in a backup plan configured with invalid storage classes.

Release Notes for Arq Backup Version 7.30.0.0

July 22, 2024

New Feature

• Added integration with pCloud. Pick "New Storage Location" from Arq's File menu, choose pCloud, and follow the prompts to add your pCloud account as a storage location for your backup data. Then pick "New Backup Plan" from Arq's File menu, choose that pCloud storage location, and follow the prompts to create your backup plan.

Release Notes for Arq Backup Version 7.29.0.0

July 8, 2024

Changes

• Reduced the list of OAuth permissions requested when connecting to Google Drive in order to meet Google's new security requirements. Arq can now only access files that Arq created in the Google Drive account.

Release Notes for Arq Backup Version 7.28.3.0

June 25, 2024

Fixed Issues

• Built with updated build tools.

Release Notes for Arq Backup Version 7.28.2.0

June 25, 2024

Fixed Issues

• Signed with new code-signing certificate.

Release Notes for Arq Backup Version 7.28.1.0

June 22, 2024

New Features

• Added support for SFTP 'none' authentication type to allow use with SFTP services like TailScale. Enter an SFTP location with a blank password and Arq will automatically detect the server allows 'none' authentication and will use that.

Release Notes for Arq Backup Version 7.27.8.0

May 3, 2024

Fixed Issues

• Fixed an issue where a file that was "Deleted/Kept" (because the backup plan's settings included keeping deleted files in subseequent backup records) which subsequently reappeared was still shown as "Deleted/Kept".

Release Notes for Arq Backup Version 7.27.7.0

March 29, 2024

Fixed Issues

• Fixed an issue where Arq would show a Google error 'unauthorized_client' instead of prompting to grant access.
• When launched, Arq attempts to check whether OAuth tokens are valid, and prompts to grant access for any token that isn't valid.
• Arq checks whether the authorized Google Cloud Storage OAuth token actually has access to the data, not just that it's a valid token, and prompts to grant access if not.

Release Notes for Arq Backup Version 7.27.3.0

March 27, 2024

Fixed Issues

• Implemented a workaround for Google Cloud OAuth because of Google's changes to OAuth scope permissions which was causing "app is blocked" errors.
• Fixed an issue where, if a backup was started and then immediately stopped, changed files wouldn't be backed up the next time a backup runs.
• Fixed an issue where, when applying 'thinning' retention rules, Arq always kept the oldest backup record no matter the retention rules.

Release Notes for Arq Backup Version 7.27.0.0

February 23, 2024

Changes

• Removed defunct Amazon Drive from list of possible storage locations.
• Added support for AWS Calgary region.

Fixed Issues

• Fixed an issue which could cause "Error communicating with the cloud server" errors when backing up to Arq Cloud.
• Fixed an issue where backups of a folder wouldn't appear on the web site if the folder wasn't available at backup time. Arq now shows the most recent backup record of the folder.

Release Notes for Arq Backup Version 7.25.19.0

January 1, 2024

Fixed Issues

• Changed Google Drive remove-item behavior from moving to trash back to permanently deleting due to multiple customer complaints of Google not freeing up quota.
• Fixed an issue which could cause errors when reading reparse points.

Release Notes for Arq Backup Version 7.25.10.0

November 1, 2023

Fixed Issues

• Fixed an issue where an in-progress backup record could be left behind when the backup finishes and no changes have been detected since the previous complete backup record.

Release Notes for Arq Backup Version 7.25.9.0

October 21, 2023

Fixed Issues

• Fixed an issue which could cause Arq to report errors when backing up "symbolic link" reparse points.

Release Notes for Arq Backup Version 7.25.5.0

October 17, 2023

Fixed Issues

• Fixed an issue where Arq would report an error when backing up a reparse point that pointed to a non-existing directory.

Release Notes for Arq Backup Version 7.25.1.0

October 16, 2023

Fixed Issues

• Fixed an issue which could cause an error during 'thinning' of backups for a backup plan where folders have been added and removed in the past.

Release Notes for Arq Backup Version 7.25.0.0

October 13, 2023

Changes

• Added support for ap-southeast-4 and il-central-1 AWS regions.
• Added 'Apply Retention Rules' menu item so you can apply the rules without doing a backup first.

Release Notes for Arq Backup Version 7.24.4.0

October 4, 2023

Fixed Issues

• Simplified backup-record-thinning logic and simplified activity-log output for it.

Release Notes for Arq Backup Version 7.24.3.0

September 27, 2023

Changes

• Added "thinning" settings to the backup plan settings.

Release Notes for Arq Backup Version 7.24.2.0

September 25, 2023

Changes

• Added a workaround for Storj's S3 incompatibility (returning a 429 HTTP status code instead of 503 as S3 does).
• Removed the "thinning" function from backup plans. Too many people found backup records were permanently deleted that they weren't expecting to be deleted, and that's a really bad user experience, so we felt it was best to remove the function. As an alternative to limit the amount of storage used by your backup plan, edit the plan, click the Retention tab, check 'Limit storage used' and enter a value.
• Changed "Delete..." button label to "Delete Backup Record..." to make it clearer what the button does; also added a confirmation dialog with a reminder that the action is permanent and cannot be undone.

Release Notes for Arq Backup Version 7.24.0.0

September 8, 2023

New Features

• Added support for backing up to a shared drive in Google Drive.
• Added support for backing up to any folder in Google Drive instead of only 'Arq Backup Data'.

Fixed Issues

• Fixed an issue which could cause Arq to start, stop, then start the backup plan unnecessarily on the next run after modifications to the backup plan.
• Fixed an issue which could cause Arq Agent to crash on startup when encountering unexpected configuration files.

Release Notes for Arq Backup Version 7.21.2.0

May 8, 2023

Fixed Issues

• Fixed an issue which could cause a "missing backupfolders.json" error if an Arq5-created backup set was adopted, edited, and then a new backup was run.
• Fixed an issue which caused a crash in restore-only mode.

Release Notes for Arq Backup Version 7.21.0.0

April 26, 2023

Improvements

• Added Import and Export buttons for a backup plan's file selections.
• Added support for new AWS regions.
• Added "Use Dual-Stack AWS Endpoint" checkbox for AWS storage locations.
• When restoring a folder containing "deleted" items (because "keep deleted files in subsequent backup records" option was checked in the backup plan, don't restore those "deleted" items. "Deleted" items can still be individually restored.
• When adding a B2 storage location and user chooses an existing bucket, show an error if bucket's lifecycle policy isn't 'keep only last version'.
• When loading backup sets, if a backup set is missing items, show it anyway (with an error message) so that the user can select it and delete it.

Fixed Issues

• Fixed an issue which prevented single-file backups created by Arq 5 from being restored correctly.
• Retry on AWS 503 errors.
• Changed 'thinning' algorithm to use GMT time zone to avoid potential issues when switching to/from daylight savings time.

Release Notes for Arq Backup Version 7.19.18.0

January 11, 2023

Improvements

• Added safeguards to prevent deletion of the wrong backup records when applying retention rules.

Fixed Issues

• Fixed an issue which could cause icons in the tree view to look garbled on Windows 11.

Release Notes for Arq Backup Version 7.19.16.0

October 28, 2022

Fixed Issues

• Fixed an issue which could cause "authentication failure" errors when setting app password.

Release Notes for Arq Backup Version 7.19.15.0

October 20, 2022

Fixed Issues

• Fixed an issue which could cause "HMACSHA256 of encryption dat file does not match" errors when attempting to browse backup records created by Arq 5 in a backup set that's also being used by Arq 7.

Release Notes for Arq Backup Version 7.19.14.0

October 17, 2022

Updates

• Added a workaround to support S3-compatible storage locations (e2, Minio) with object lock which return non-standard error codes when attempting to delete a locked object, causing Arq to report an error for an action which isn't actually an error.

Release Notes for Arq Backup Version 7.19.12.0

September 6, 2022

Updates

• Updated Google OAuth authorization process to comply with Google's policy change deprecating the OAuth "out-of-band" flow.
• Store the key derived from the "app password" instead of the actual app password. This protects against malware running as root potentially stealing the app password, which a user might reuse elsewhere.
• Return a better error message from B2 when a file is not found instead of B2's generic "file with such name does not exist" message.

Release Notes for Arq Backup Version 7.19.10.0

September 6, 2022

Fixed Issues>

• When backing up to an SFTP server, retry up to 5 times rather than retrying for up to 60 seconds, to ensure that Arq retries in the case of a timeout.
• Instead of storing the backup plan encryption password (accessible only by root), store the encryption key derived from it (accessible only by root). This protects against malware running as root potentially stealing the encryption password, which a user might reuse elsewhere, thus potentially giving an attacker access to data beyond that legitimately needed for Arq's normal operation. This addresses CVE-2022-36617 filed by Sam Haskins.

Release Notes for Arq Backup Version 7.19.5.0

June 13, 2022

Fixed Issues

• Fixed an issue where the 'thinning' process could be skipped for 'all-drives' backup plans.
• Fixed a display issue where Arq displayed the wrong region after adding a Google Cloud storage location with an existing bucket.

Release Notes for Arq Backup Version 7.19.3.0

May 12, 2022

New Features

• Added support for new Wasabi Sydney region.
• Added support for GovCloud as an S3-compatible storage location.

Release Notes for Arq Backup Version 7.19.0.0

April 14, 2022

New Features

• Added Storj as a storage location type.
• Added 'arqc' command-line utility for activating and deactivating license code, starting and stopping backup plans and retrieving status and activity log.

Fixed Issues

• Fixed an issue that could cause agent crash when restoring a directory from a backup record created by Arq 5.

Release Notes for Arq Backup Version 7.18.0.0

March 29, 2022

Fixed Issues

• Fixed an issue where auto-update would download and install an update that wasn't included with your license's updates. Arq 7.18 will accept all Arq 7 licenses regardless of updates-end-date in order to work around this issue for people who experienced it. If you experienced this issue and worked around it by purchasing a renewal that you didn't want to purchase, please email us at support@arqbackup.com and we'll promptly refund your renewal purchase.

Release Notes for Arq Backup Version 7.17.0.0

March 28, 2022

New Features

• Added support for Wasabi Toronto (ca-central-1) region.

Release Notes for Arq Backup Version 7.16.0.0

March 22, 2022

Fixed Issues

• Accept all Arq 7 licenses regardless of updates-end-date in order to avoid issues with people who had an Arq version older than 7.13 and subsequently turned on auto-update and received a version newer than their license's updates-end-date. All versions of Arq prior to 7.15.1 will update to 7.15.1. Arq 7.15.1 and future versions will update to the latest version available unless it's newer than the license's updates-end-date.

Release Notes for Arq Backup Version 7.15.0.0

March 14, 2022

Changes

• Added support for new Wasabi eu-central-2 region.

Fixed Issues

• If, when expanding a OneDrive storage location, Arq gets an 'access revoked' error from Microsoft, prompt to grant access again.
• Fixed an issue which could cause 'access denied' errors when connecting to an SMB network volume without using a username or password.
• Fixed an issue which could cause a crash of Arq.exe when encountering unexpected data browsing backup plans.

Release Notes for Arq Backup Version 7.14.1.0

January 28, 2022

Changes

• Added support for new Wasabi eu-west-2 region.

Fixed Issues

• Truncate activity log text in email reports to avoid unreasonably large emails.
• Fixed an issue where, on startup, Arq would report "Arq 7 license expired" if the latest update is installed on top of Arq that had been previously configured with a license that had expired and was renewed at the server.

Release Notes for Arq Backup Version 7.13.4.0

January 28, 2022

Fixed Issues

• Fixed a license activation issue for some customers.
• Fixed an issue which could cause 'missing date in license data' error for lifetime license customers.

Release Notes for Arq Backup Version 7.13.3.0

January 25, 2022

Fixed Issues

• Fixed an issue which could cause a crash with "read-only mode".

Release Notes for Arq Backup Version 7.13.2.0

January 24, 2022

Fixed Issues

• Fixed an issue with the display of updates end date in Arq's preferences.

Release Notes for Arq Backup Version 7.12.3.0

January 7, 2022

Fixed Issues

• Fixed an issue that could cause "Unexpected character encountered" when attempting to browse Arq Premium data or create a backup plan using Arq Premium.

Release Notes for Arq Backup Version 7.12.0.0

December 17, 2021

Changes

• Changed Arq's behavior regarding unknown objects found when adopting backup sets (or upgrading from Arq 5). On first backup after adopting a backup set, Arq will initialize its database from existing data as much as possible; it will reuse objects as much as it can and leav the remaining objects alone. The "Remove Unreferenced Data" function will delete all unreferenced data, including objects found during initialization that weren't referenced by any backup record that Arq was successfully able to read during initialization. This resolves the scenario where, with Arq 5, the user may have deleted backup records but not executed Arq 5's "Remove Unreferenced Data" function.
• Retry on HTTP 408 errors.
• Changed the retention behavior: When applying retention rules after backup, Arq now writes to the activity log every backup record date/time and whether it was kept or deleted.

Fixed Issues

• Fixed a bug that could cause a crash when clicking "Create Backup Plan" with no storage locations configured (which causes the add-storage-location dialog to appear) and then clicking Cancel on the add-storage-location dialog.
• Fixed an issue where Arq could crash if the Restore button is clicked before a storage location has been selected.
• Fixed an issue that could cause a null-reference exception when browsing S3 data in a versioned bucket where versioning has been turned off and later turned on, resulting in some objects with 'null' as the version ID.
• Fixed an issue where script arguments weren't being passed correctly when executing postflight scripts.
• Fixed tab navigation issues in the edit-backup-plan window.

Release Notes for Arq Backup Version 7.11.0.0

November 30, 2021

Fixed Issues

• Fixed an issue where Arq would report an error for an SFTP storage location where the path is a symlink to a directory (instead of a regular directory).
• Fixed an issue which could cause 'ArgumentOutOfRangeException' when applying retention rules.
• Fixed an issue where Arq could initialize its database from existing backup records, find errors, and report errors for the wrong backup recorsd.

Release Notes for Arq Backup Version 7.10.0.0

November 16, 2021

Improvements

• Added support for Wasabi eu-west-1 (London) region.

Fixed Issues

• Fixed an issue where, if the preflight script fails, file-change notifications are lost until the next full fiile scan.
• Fixed issues with applying retention settings.
• Check for .NET version 4.7.2 or later, and write to event log if it's not available.
• Fixed an issue where no-backups-after-n-days alerts weren't being shown.
• Removed a workaround that was causing Arq to retry on erroneous Amazon Drive 400 errors (which Amazon Drive seems to have stopped sending).

Release Notes for Arq Backup Version 7.9.6.0

November 5, 2021

Improvements

• Added a workaround for Amazon Drive's inconsistency in showing accurate directory contents for just-created directories.

Release Notes for Arq Backup Version 7.9.1.0

November 5, 2021

Improvements

• Added support for Wasabi ap-northeast-2 region.
• Prompt for a storage class when creating an all-drives or all-user-data backup plan on AWS, instead of defaulting to Standard.
• Suppoort adopting a backup set that was copied from a non-object-lock bucket to an object-lock bucket by resetting the backup set's bucket-versioning-is-on flag.
• During restore, if Arq encounters data that Arq expects as readable but the user has modified to be Glacier or Deep Archive, request that objects be made downloadable.

Fixed Issues

• Added a workaround for unexpected error responses from Microsoft Graph API (OneDrive/SharePoint).
• Fixed an issue where network-transfer-rate limit wasn't being used when backing up to SFTP.
• Fixed an issue where deleted/kept files weren't properly being marked as deleted/kept when the "keep deleted files in subsequent backup records" option was enabled in the backup plan.
• Fixed an issue that could cause errors when encountering objects in an S3 bucket with "null" version IDs, e.g. when versioning is enabled, disabled, then enabled again on a bucket.

Release Notes for Arq Backup Version 7.8.2.0

September 23, 2021

Fixed Issues

• Fixed an issue that could cause 'expired_auth_token' errors when backing up to B2.
• Fixed an issue that could cause 'Object reference not set to an instance of an object" errors when reading data from Amazon Drive.

Release Notes for Arq Backup Version 7.8.0.0

SEptember 20, 2021

Fixed Issues

• Fixed an issue which could cause not-found errors when reusing backup data originally creatd by Arq 3 and stored in Glacier, and then adopted by Arq 5 and then Arq 6 and then Arq 7.
• At backup start, check whether computer is on an allowed network before trying to connect to the storage location, to avoid unnecessary error reports.
• Fixed an issue which could cause a 'The given key was not present in the dictionary' when adopting a backup set created by Arq 6 that had a different disk identifier for the root volume than the computer's root volume's disk identifier.

Release Notes for Arq Backup Version 7.7.9.0

August 16, 2021

Fixed Issues

• Fixed an isuee that could cause incorrect sizes and file counts in backup records.
• Fixed an issue that could cause "Object reference not set to an instance of an object" error when saving an in-progress backup record if one or more folders configured in the backup plan are missing at backup time.

Release Notes for Arq Backup Version 7.7.7.0

August 16, 2021

Fixed Issues

• Fixed an issue that could cause "Object reference not set to an instance of an object" errors during backup.
• Fixed an issue that could cause "Object must implement IConvertible" errors when encountering unexpected data.
• Fixed an issue that could cause "PATCH HTTP error 500" errors when encountering multiple folders with the same name in the same folder in Google Drive.

Release Notes for Arq Backup Version 7.7.3.0

August 11, 2021

Fixed Issues

• Fixed an issue that could cause "Error saving directory metadata: bad parameter or other API misuse" error.
• Fixed an issue where Arq Monitor wasn't showing the status message "paused" when the backup was paused.

Release Notes for Arq Backup Version 7.7.0.0

August 10, 2021

New Features

• Added a tooltip over the 'Modified' column that describes which values have changed.
• Pressing Enter in the search box starts a search.
• Upgraded the SMTP library to support more SMTP servers.

Fixed Issues

• Fixed an issue which could cause slow performance when saving an in-progress backup record.
• Fixed an issue which caused the backup plan's CPU usage to reset to 50 when the user changes it to 0.
• Fixed an issue which could search to fail to finish.
• If an error occurs during search, show the error and continue searching the other backup sets.
• Added a check for invalid entered time-of-day value like 24:00.
• Fixed an issue where the Delete activity view showed irrelevant fields.
• For "Unable to connect to the remote server" errors, include the URL with the error message.
• Improving caching for storage locations that use item IDs (Amazon Drive, Google Drive).
• Fixed an issue which could cause "Error saving directory metadata" error.
• Fixed an issue where the Arq main window showed the next backup time with the wrong time zone.
• Fixed an issue where date values were incorrectly determined to be unequal, causing Arq to determine the backup plan has been modified and files need to be rescanned.
• Changed activity log bytes scanned and bytes uploaded to show more-readable values like "5 MB" instead of "5,234,221 bytes".
• Fixed an issue where the next transfer-rate change time could be calculated with the wrong time zone.

Release Notes for Arq Backup Version 7.6.0.0

June 12, 2021

New Features

• Added support for Wasabi ap-northeast-1 (Tokyo) region.

Fixed Issues

• Fixed an issue where Arq didn't report an error when restoring from Glacier with an IAM user that didn't have sufficient permission to restore Glacier objects.
• Added a workaround for browing backup records when the 'backupfolder.json' file is missing.
• Fixed an issue restoring from a single-file backup record.
• Fixed an issue where Arq wasn't always retrying on transient Arq Cloud Storage errors.
• Fixed an issue where Arq reported the backup plan had changed when it hadn't changed.

Release Notes for Arq Backup Version 7.5.44.0

June 12, 2021

Fixed Issues

• Fixed an issue which could cause 'Backup plan has changed' messages when the backup plan hasn't changed.
• Fixed an issue where Arq wasn't retyring in the case of a transient error backing up to Arq Cloud storage.
• Fixed an issue which could cause a block when reading from Google Drive.
• Added a workaround for using data originally created by Arq 5 on a Mac, then adopted with Arq 5 on Windows, then used by Arq 7 on Windows.

Release Notes for Arq Backup Version 7.5.35.0

June 8, 2021

Fixed Issues

• Fixed an issue that could cause 'Error creating cloud account' for some users.
• Fixed an issue that prevented throttling of uploads in some cases when the backup plan has a transfer rate limit set.
• Fixed an issue where the icons for the backup plans weren't always updated.
• Fixed an issue where OneDrive aborted a file-upload session and Arq reported it as an error instead of retrying.
• Fixed a typo in the edit-backup-plan-options dialog.

Release Notes for Arq Backup Version 7.5.32.0

June 1, 2021

Fixed Issues

• Fixed an issue which could cause 'Object reference not set to an instance of an object' errors when accessing Arq Cloud storage.

Release Notes for Arq Backup Version 7.5.30.0

May 31, 2021

Fixed Issues

• Fixed an issue that could cause an error during backup after changing the backup plan's encryption password.
• Fixed an issue that could cause a not-found error when restoring from a backup record whose timestamp ends in .999 seconds.

Release Notes for Arq Backup Version 7.5.27.0

May 27, 2021

Fixed Issues

• Fixed an issue that could cause Arq to report errors on extending object lock if you modify the object lock interval to a smaller number (because object lock duration can't be reduced once set).
• Fixed an issue where the Arq Premium region selector is shown when a region has already been selected.
• Rewrote B2's error message "File with such name does not exist" to "File not found".

Release Notes for Arq Backup Version 7.5.25.0

May 19, 2021

Fixed Issues

• Fixed an issue where the from/to times on scheduled transfer rate restriction were not properly using the computer's configured time zone.
• Fixed an issue not all objects in the latest backup record of an object-lock backup plan were locked.
• Fixed an issue that could cause not-found errors when reading from an S3 bucket with versioning enabled.

Release Notes for Arq Backup Version 7.5.22.0

May 19, 2021

Fixed Issues

• Improved backup performance.
• Improved error message when Arq tries to create a file but Arq's cache is out of date with respect to Google Drive data.
• Catch any unexpected exceptions when volume is unmounted.
• Fixed an issue where creation time wasn't being properly restored.
• Fixed an issue which could prevent browsing data in an S3 or S3-compatible bucket with object-lock enabled.

Release Notes for Arq Backup Version 7.5.18.0

May 6, 2021

Fixed Issues

• Fixed an issue with regular expressions using \d syntax.
• Fixed an issue with checking for bucket versioning using Minio.

Release Notes for Arq Backup Version 7.5.16.0

April 30, 2021

Fixed Issues

• Fixed an issue which could cause errors during backup when caching data files.
• Fixed an issue where loading of Arq 5 backup records is blocked when an error is occurred from an Arq 5 backup record.
• Fixed an issue which could erroneously report an error about 'unexpected nulls' encountered.

Release Notes for Arq Backup Version 7.5.14.0

April 27, 2021

Fixed Issues

• Fixed an issue where smaller objects weren't being combined into pack files in all cases.
• Improved caching.

Release Notes for Arq Backup Version 7.5.7.0

April 22, 2021

Changes

• Added *.wasabisys.com to list of hosts that support S3 object versioning.
• Added support for adopting a backup set that's been copied from a non-object-lock bucket to an object-lock-enabled bucket.
• When adding an S3 or Wasabi storage location, if the credentials don't have ListAllMyBuckets permission, prompt for manually entering a bucket name instead of reporting an access-denied error.

Fixed Issues

• Fixed an issue where errors deleting a backup set weren't being reported in the delete activity log.
• Fixed an issue which could cause "authentication error" on startup when the PC's language is set to Greek.
• Fixed an issue that could cause a "Rate Limit Exceeded" error when browsing Google Drive data.
• Fixed an issue which could cause "Object reference not set to an instance of an object" error when there's a problem reading Google Drive folder contents.

Release Notes for Arq Backup Version 7.5.1.0

April 19, 2021

Improvements

• Added immutable backups feature for storage locations which support it (S3, B2 with S3-compatibility API, and soon Wasabi). If you enable immutable backups, Arq will lock your backup reocrd data to protect against ransomware or accidental deletion.
• Modified the new-backup-plan flow to encourage choosing an encryption password.

Fixed Issues

• Fixed an issue where the email report could show a 'bad gateway' error for Arq Premium backups when communicating with cloud.arqbackup.com.
• Fixed an issue where the backup set name (stored in backupconfig.json) was not being updated at the next backup time after a computer's name had changed.
• Fixed an issue which could cause Arq to use the wrong region when adding a Wasabi storage location.
• Changed 'Validate Backup Data Now' function to 'Back Up and Validate' which creates a backup record and validates every referenced object along the way.

Release Notes for Arq Backup Version 7.4.0.0

April 7, 2021

New Features

• Added Polycloud as a storage location option.

Fixed Issues

• Added a workaround for volumes that Arq doesn't get proper connect/disconnect notifications for.
• Fixed an issue where file modification and creation times weren't being properly restored from Arq 5 backups.
• Fixed an issue where SFTP connection failed to retry on connection error.
• Fixed an issue which could cause a 'Value cannot be null' error when browsing Arq 5 data where no password was entered (because it's an active backup plan and the agent already has a secure copy of the password).
• Fixed an issue where a file wasn't always reported as uploaded if only some parts of it were actually uploaded.
• Fixed an issue that could cause 'Failed to decrypt' errors when adding a network interface to the backup plan's options.
• Fixed an issue where displaying extremely large activity logs could cause the Arq app to crash.
• Fixed an issue that could cause a crash when an error occurs during search.
• Allow any UNC path (including paths with $ characters) when adding a network volume.
• Improved agent logging when getting the contents of a large Google Drive folder.

Release Notes for Arq Backup Version 7.3.0.0

March 26, 2021

New Features

• Added Filebase as a storage option.

Release Notes for Arq Backup Version 7.2.16.0

March 23, 2021

Fixed Issues

• Fixed an issue that could cause DLL-not-found errors.
• Fixed an issue that could leave behind tray icons after update.
• Fixed an issue where communication between Arq Agent and clients (Arq and ArqMonitor) wasn't being encrypted.
• Fixed an issue that could cause an error 'standardIAObjectDirs missing' when adopting an older backup set.
• Fixed an issue that could cause regex exclude rules to fail to match.

Release Notes for Arq Backup Version 7.2.9.0

March 17, 2021

Fixed Issues

• Fixed an issue where, if you changed the backup plan's name, the "blob identifier type" was being reset to SHA256 for the backup plan. If it was originally SHA1 (e.g. for a backup plan upgraded from Arq 5) this could cause re-uploading of data.
• Fixed an issue where labels on the main window weren't reliably being refreshed when data changed.

Release Notes for Arq Backup Version 7.2.7.0

March 14, 2021

Fixed Issues

• Only write 'Uploaded file...' to the activity log if file data was actually uploaded, not just if the file's modification date has changed.
• When caching Arq 5 pack indexes, if there's an error reading an index file, attempt to recreate it from the associated pack file.
• Retry when Microsoft Graph API returns an HTTP 429 error.
• Fixed an authentication issue with SFTP storage locations configured with private key + passphrase.
• Show a more informative error message when there's a time-difference error communicating with AWS.
• Fixed an issue with restoring from Glacier and Deep Archive backup records.
• Fixed an issue where the Stop button wouldn't cause a restore activity to stop.

Release Notes for Arq Backup Version 7.2.0.0

March 5, 2021

Improvements

• Added support for new Google Cloud Storage regions.

Fixed Issues

• Fixed an issue where an unexpected error with 1 backup record would cause the import of Arq 5 data to fail.
• Fixed an issue where status icons weren't set corectly for active backup plans on app startup.
• Fixed an issue where cleanup didn't happen in all cases.
• Fixed an issue with monthly retention.

Release Notes for Arq Backup Version 7.1.39.0

March 5, 2021

Fixed Issues

• Fixed an issue which could cause 'key not present in dictionary' errors when sending an email report.
• Handle unexpected exceptions when reading drive type and format for a connected drive.
• If Arq is opened and the PC's display has changed and Arq's previous window coordinates are now not within the display's bounds, open the Arq window at the default location.
• Handle unexpected exceptions when reading the last write time of some NAS files.
• Retry for up to 60 seconds when attempting to communicate with an SFTP server during backup or restore.

Release Notes for Arq Backup Version 7.1.35.0

March 1, 2021

Fixed Issues

• Fixed a licensing issue.

Release Notes for Arq Backup Version 7.1.34.0

March 1, 2021

Improvements

• Improved efficiency of querying for B2 file lists.
• Improved memory management.

Fixed Issues

• Fixed an issue that could cause "missing hmacKey" errors when adopting a backup set that was originally created with Arq 4.
• Fixed an issue which could cause a crash when adding an S3 bucket in the us-west-2 region.
• If an Arq 5 index file is missing, recreate it from the pack file.
• When Arq is updated and ArqMonitor restarts, remove the tray icon before exiting.

Release Notes for Arq Backup Version 7.1.27.0

February 24, 2021

Fixed Issues

• Fixed display issues when display is scaled.

Release Notes for Arq Backup Version 7.1.23.0

February 19, 2021

Fixed Issues

• After backup, if a backup folder is empty, delete the backup folder.
• Fixed an issue where a backup folder name containing an ampersand wasn't being displayed properly.
• Fixed an issue that could cause backup record not found error when deleting thinned backup records.
• Fixed an issue where we weren't saving a new backup record when the backup plan is changed, causing a rescan at next backup time.
• Fixed an issue that could cause 'object must implement IConvertible' errors when reading Arq 5 backup records created by macOS.

Release Notes for Arq Backup Version 7.1.15.0

February 12, 2021

Fixed Issues

• Fixed an issue that could prevent the computer from going to sleep even when no backups are running.
• Fixed an issue that unnecessarily delayed ArqAgent windows service shutting down.
• Fixed an issue that could cause ArqMonitor to crash if 'Pause...' is selected a second from its menu when the pause dialog is already visible.
• Abort more quickly if the backup is in the process of saving and in-progress backup record and the user requests stop.
• If a backup starts while Arq is manually paused, pause the new backup job.
• Fixed an issue during enforcement of dollar-based AWS budget the total dollars was rounded down to the nearest dollar.
• Fixed an issue which could cause 'Calculate Stored Size' to return 0 for Google Drive backup sets.
• Fixed a potential crash when encountering unexpected missing mount point values when running a backup plan.
• Fixed an issue where email reports weren't sent in all cases.
• Always exclude C:\ProgramData\ArqAgent when backing up.
• Do not abort a remove-unreferenced-objects process if a volume is unmounted.
• Fixed an issue where the Clear Cache button was visible for storage locations that do not have cached item IDs.

Release Notes for Arq Backup Version 7.1.12.0

February 8, 2021

Fixed Issues

• Fixed an issue which could cause 'unexpected network-volume storage location path' error when creating a backup plan using a network-volume storage location.

Release Notes for Arq Backup Version 7.1.11.0

February 8, 2021

Fixed Issues

• Fixed an issue where restoring from an older backup record (created by Arq 5) within a backup set adopted by Arq 7 that was moved/copied from a different storage location type could result in object not found errors.
• Run preflight script (if configured) before checking whether storage location is reachable.
• Check for up to 15 seconds for storage location reachability before aborting the backup activity.

Release Notes for Arq Backup Version 7.1.10.0

February 7, 2021

Fixed Issues

• Fixed issues with displaying correct license information in the preferences window for lifetime licenses.

Release Notes for Arq Backup Version 7.1.9.0

February 3, 2021

Fixed Issues

• Fixed errors in importing Arq 5 network volumes.
• When adding a folder storage location, use path instead of the volume's disk identifier.

Release Notes for Arq Backup Version 7.1.7.0

February 3, 2021

Fixed Issues

• Fixed an issue that could cause "Value cannot be null" error when restoring from an older backup record (created by Arq 5) within an active backup set.
• Fixed an issue which could cause incorrect last-modified dates to be displayed for older backup records.

Release Notes for Arq Backup Version 7.1.6.0

February 3, 2021

Fixed Issues

• Fixed an issue that could cause 'Stream does not support writing' error when creating a backup plan on a network volume.

Release Notes for Arq Backup Version 7.1.5.0

February 2, 2021

Fixed Issues

• Fixed an issue that could cause a crash when opening the preferences window for some license types.

Release Notes for Arq Backup Version 7.1.4.0

February 2, 2021

Official Arq 7 Release

More power, more security, more storage savings.

Perfect backups

Arq uses Windows Volume Shadow Copy Service to create perfectly consistent backups of your files every time.

If you're modifying your files as they're being backed up, it won't affect the backups.

More power

• Run multiple backup jobs in parallel
• Scans and uploads files in parallel for faster throughput
• Only scans changed files/directories after the initial backup (uses filesystem events to detect changes on macOS and Windows)
• New data format which eliminates the need for reading metadata before browsing/downloading from backups.
• You can limit the scheduled backups to certain days of the week
• You can limit transfer rate to certain times of the day at certain days of the week
• Powerful new rules for selecting which files and folders are included and excluded from backup
• Time-based retention rules in addition to budget-based rules
• Optionally keep deleted files in subsequent backups for easy locating of deleted files
• Get alerts when no backups have occurred for days

More secure

• Set a password on Arq 7 to prevent others from opening Arq and deleting backups.
• Uses SHA256 for checksums instead of SHA1.

More storage savings

• Arq 7 can back up to AWS Glacier Deep Archive. Store your backups there for $0.99/TB per month.
• Arq 7 can back up to Google Cloud Archive. Store your backups there for $1.230/TB per month with instant access to backups..

New Arq Premium subscription option

All the features of Arq 7 plus:

• 1 TB storage included
• Up to 5 computers
• Simpler configuration
• Secure web access to your backups
• $5.99/month (extra storage billed at $.00599/GB per month)

Even more features

• All-new, modern user interface
• Disk device tracking instead of path-based — multiple external drives with the same name are treated as separate
• Faster object cleanup
• Faster validation
• Faster search
• Destination-agnostic, portable data format that's open and documented
• Progress bars showing percent complete
• Wake for backup
• More informative SMTP test results — full SMTP connection log when an error occurs
• Proper connection pooling for SMB and SFTP destinations with a configurable number of maximum threads — useful for SFTP storage locations that limit the number of simultaneous connections
• Optionally start a backup as soon as a volume is connected to the computer

Release Notes for Arq Backup Version 7.0.56.0

February 1, 2021

Fixed Issues

• Fixed an issue which could cause "Access denied" errors when backing up read-only files.

Release Notes for Arq Backup Version 7.0.55.0

February 1, 2021

Fixed Issues

• Fixed an issue where Arq would report a null error if it encounters a missing pack file when loading its database from Arq 5 data.

Release Notes for Arq Backup Version 7.0.54.0

January 29, 2021

Fixed Issues

• Fixed an issue where ArqAgent could crash when a device is attached.
• Fixed an issue which could cause multiple backup folders with the same name when backing up an all-drives backup plan.

Release Notes for Arq Backup Version 7.0.51.0

January 29, 2021

Fixed Issues

• If an error occurs sending an email report, in the activity log preface the error message with 'Failed to send mail' to clarify where the error is coming from.
• Fixed a crash that occurs when adding a B2, S3 or Google Cloud storage location and no buckets exist.
• Fixed an issue where the log level setting wasn't being applied correctly.
• If Arq Agent crashes, ArqMonitor shows a notification.
• Fixed an issue where, when attempting to browse a backup record when the previous backup record was unreadable, Arq would show an error message instead of showing the valid backup record.

Release Notes for Arq Backup Version 7.0.45.0

January 20, 2021

Improvements

• During backup set database initialization, write the names of all 'unknown' objects to the activity log, along with a total.

Fixed Issues

• Fixed broken Edit button for S3-compatible storage locations.
• Removed duplicate storage classes in combo box for all-drives storage class.
• Fixed an issue that could where some exclude paths didn't properly match file paths.
• Fixed an issue which caused object-not-found errors when restoring from Google Drive backups created by Arq 5.19.2 or later.

Release Notes for Arq Backup Version 7.0.44.0

January 20, 2021

Fixed Issues

• Fixed an issue with adding a Google Cloud storage location and choosing an existing bucket.
• When user removes active backup plan, don't remove it from storage location's list.
• Fixed an issue where volumes were volumes connected to the computer weren't being recognized by Arq Agent in some cases.

Release Notes for Arq Backup Version 7.0.41.0

January 19, 2021

Fixed Issues

• Fixed formatting problems storing and displaying wildcard exclude rules with backslashes in them.
• Fixed a crash in Arq.exe when editing a backup folder plan of an external drive when the external drive is disconnected.

Release Notes for Arq Backup Version 7.0.40.0

January 19, 2021

Fixed Issues

• Fixed 'volume not found' error when editing exclusions for an SMB folder.
• Fixed an issue where the backup activity rescans all folders for an all-drives backup plan if the set of attached drives changes.
• When a volume is added, add it to the list of changed directories so it gets scanned at next backup time.
• Retry S3 requests on RequestTimeTooSkewed error.
• Fixed an issue where, if you upgrade from a selected-items Arq 6 backup plan to Arq 7, do a backup, then change the backup plan to all-drives, the subsequent backup records would get attached to a random folder.

Release Notes for Arq Backup Version 7.0.39.0

January 18, 2021

Fixed Issues

• Fixed an issue that could ArqAgent to report errors when backing up an empty UNC directory.
• Fixed layout of the preferences window when display is scaled to 200%.

Release Notes for Arq Backup Version 7.0.38.0

January 18, 2021

Fixed Issues

• Fixed an issue where the Show Log button didn't remain visible when the backup activity ended.
• Fixed an issue where exclude rules weren't being correctly applied.
• Fixed an issue where ArqAgent could crash when encountering unexpected data on an SMB volume.
• Fixed an issue where ArqAgent used a potentially out-of-date backup plan when restarting.

Release Notes for Arq Backup Version 7.0.35.0

January 13, 2021

Fixed Issues

• When listing backup sets in a storage location, if there's an error with any of the backup sets, show the error in the displayed list.
• Fixed an issue which could cause the agent to crash when an unexpected error occurs during backup.
• Fixed typo 'delete existing backup rcords'.

Release Notes for Arq Backup Version 7.0.29.0

January 9, 2021

Fixed Issues

• Fixed an issue that could cause Arq Agent to crash when an unexpected USB device is plugged in.

Release Notes for Arq Backup Version 7.0.28.0

January 9, 2021

Fixed Issues

• Fixed an issue where auto-update failed because the existing Arq processes weren't killed.

Release Notes for Arq Backup Version 7.0.21.0

January 9, 2021

Fixed Issues

• Fixed an issue which could cause Arq Agent to crash when attempting to register for events from removable devices.

Release Notes for Arq Backup Version 7.0.19.0

January 5, 2021

Fixed Issues

• Fixed an issue which could cause a 'Nullable object must have a value' error when saving a backup plan.
• Fixed an issue which could cause storage locations to remain visible after you delete them, until app restart.

Release Notes for Arq Backup Version 7.0.17.0

January 3, 2021

Fixed Issues

• Fixed an issue where unchecked (excluded) items within a folder in a backup plan weren't being saved to the backup plan.
• Fixed incorrect labels in the backup plan retention settings panel.

Release Notes for Arq Backup Version 7.0.15.0

January 2, 2021

Fixed Issues

• Fixed an issue that could cause Arq to crash when editing a folder in a backup plan when 'track by disk identifier' is checked for the folder.
• Fixed an issue where the old Arq.exe didn't exit when an Arq update was installed.

Release Notes for Arq Backup Version 7.0.12.0

January 2, 2021

Fixed Issues

• Fixed an issue where the Windows service could take too long to exit on app-update, causing the new version's Windows service to fail to start.

Release Notes for Arq Backup Version 7.0.8.0

January 1, 2021

Improvements

• Added checkbox to turn auto-update on/off.
• Added Check for Update button to preferences dialog.

Fixed Issues

• Fixed ArqMonitor's "Open Arq" menu item function.
• Fixed an issue that could cause an agent crash when adopting a backup set created by Arq 6.

Release Notes for Arq Backup Version 7.0.0.19

December 30, 2020

Improvements

• Added 'Send Agent Log to Support' function to the Help menu.

Fixed Issues

• Fixed ArqMonitor's "Open Arq" menu item function.

Release Notes for Arq Backup Version 7.0.0.18

December 29, 2020

Fixed Issues

• Fixed an issue that could cause the Windows service to fail to start properly during installation if Arq 6 is not uninstalled prior to installing Arq 7.

Release Notes for Arq Backup Version 7.0.0.17

First pre-release version of Arq 7 for Windows.