Microsoft fixes Windows File History backup issue

Microsoft has fixed a known issue that could stop the built-in File History backup feature from working on some Windows systems after the September 2026 security updates.

Introduced in Windows 8 and later replaced by Windows Backup, File History automatically copies files from a user’s profile to an external drive or network storage location. It can also restore accidentally deleted or damaged files from older versions.

Microsoft warned that the feature might stop creating or updating backups, with affected systems recording application crashes involving FileHistory.exe and KERNELBASE.dll. On Windows 10 21H2 or later, Windows 10 Enterprise LTSC 2016/2019, and Windows 11 23H2 and later, users could also see “Reconnect your drive” alerts even when compatible drives were connected. Previously backed-up files might show “No previous version available”, while the “Last Backup” timestamp failed to update.

On Tuesday, Microsoft said the issue had been fixed for Windows 11 customers and was rolling out through the optional KB5124006 and KB5124010 cumulative updates for Windows 11 26H1 and Windows 11 24H2/25H2, respectively.

Users who do not install the optional updates will receive the fix in the next month’s Patch Tuesday updates, scheduled for October 13. Microsoft’s service alert was seen by BleepingComputer.