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Install Arq

A backup software for your Mac or Windows PC.

Install with winget
winget install --id HaystackSoftware.Arq
Upgrade
winget upgrade --id HaystackSoftware.Arq
Uninstall
winget uninstall --id HaystackSoftware.Arq

About Arq

A backup software for your Mac or Windows PC.

What's new in 7.44.0.0

Improvements - When a cloud-files sync provider (OneDrive, Dropbox) is offline and Arq cannot enumerate a cloud-placeholder directory, the failure is now handled per the backup plan's dataless-files policy: "Ignore" silently skips the directory, "Error" records a per-directory error, and "Materialize" logs that the directory could not be materialized. (There is no Windows API to force-populate a dataless directory beyond the enumeration call itself, so "Materialize" on a failed enumeration is best-effort and reports an error.) - Added "Skipped dataless file" and "Skipped dataless directory" lines to the activity log when the dataless-files policy is set to "Ignore", so users can audit what was omitted from a backup. - When a pCloud upload fails with a size or sha1 mismatch (pCloud occasionally stores fewer bytes than were sent) or a transient network error, Arq now retries the upload (up to 8 non-transient attempts) instead of failing the whole backup record. Cancellation is honored within one retry iteration. Bug Fixes - Fixed OneDrive and Dropbox folders being silently skipped when the backup plan's dataless-files policy was set to "Ignore", even when every file inside was fully downloaded locally. Arq now always recurses into cloud-managed (CFAPI) directories regardless of the folder's cloud-placeholder reparse tag; the per-file dataless-files policy still governs whether individual dataless files are skipped, errored, or materialized. Behavior change: users on "Ignore" who previously had whole OneDrive/Dropbox subtrees omitted from their backup will now see the locally-...

Read release notes

Version history

Version Updated Notes
7.44.0.0 Unknown Improvements - When a cloud-files sync provider (OneDrive, Dropbox) is offline and Arq cannot enumerate a cloud-placeholder directory, the failure is now handled per the backup plan's dataless-files policy: "Ignore" sile...
7.43.0.0 Unknown New Features - Added a backup plan option to specify whether to report, ignore, or materialize dataless ("cloud-only") files such as OneDrive Files On-Demand and Dropbox files. When set to "Materialize", Arq triggers the...
7.42.0.0 Improvements - pCloud uploads are now additionally verified by fetching the file's checksum from pCloud after upload and comparing it to the expected value. This was added after a case where pCloud failed to save all byt...
7.40.1.0 Unknown Bug Fixes - Fixed the backup-plan detail view still saying "Y GB budget (not yet backed up)" after the first backup. The budget row now updates immediately when the backup set is initialized. - Fixed the budget progress...
7.40.0.0 Unknown New Features - Added Arq Premium storage dashboard with usage bar, backup set table, and recommendations. - Show Arq Premium stored size in the main window. - Added a new activity errors view on the activity detail panel...
7.39.0.0 Unknown New Features - Added support for immutable backups using Google Cloud Storage. - Added a "Recover" button for storage locations that support immutable backups. Clicking "Recover" causes Arq to scan the backup set and att...
7.38.6.0 Unknown Release notes
7.38.5.0 Unknown Fixed Issues - Decode the OAuth code that Microsoft returns before attempting to query for an OAuth refresh token; Microsoft seems to be now returning codes with URL-encoded values in them. This resolves the "HTTP 400 er...
7.38.4.0 Unknown Fixed Issues - Fixed an issue which caused ArqMonitor to fail to start.
7.38.2.0 Unknown Fixed Issues - Fixed an issue which caused ArqMonitor to fail to start.
7.38.1.0 Unknown 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 t...
7.38.0.0 Unknown 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 t...
7.36.2.0 Unknown 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.
7.36.0.0 Unknown New Features - Added built-in support for Mega's S4 cloud storage service.
7.35.1.0 Unknown Fixed Issues - Fixed an issue where ArqAgent wouldn't allow startup for newer updates to .NET 4.7.
7.35.0.0 Unknown 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 er...
7.33.1.0 Unknown 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...
7.33.0.0 Unknown New Features - Added support for new Wasabi eu-west-3 region.
7.32.0.0 Unknown Changes - Added support for new Wasabi Milan (eu-south-1) region.