Microsoft fixes bug that broke Windows File History backup feature
Recorded: Sept. 24, 2026, 9 a.m.
| Original | Summarized |
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Microsoft addressed a known issue that disrupted the functionality of the built-in File History backup feature across certain Windows systems following the installation of the September 2026 security updates. File History is a feature integrated into Windows 8 and later designed to automatically back up user account profile contents, including Documents, Music, Pictures, Videos, and Desktop folders, to external storage such as USB drives or network storage locations like NAS, allowing users to restore previously deleted or damaged files. Prior to the fix, installing these security updates reportedly caused application crashes, evidenced by events in the Event Viewer referencing FileHistory.exe and KERNELBASE.dll. Impacted systems running Windows 10 21H2 or later, Windows 10 Enterprise LTSC 2016/2019, and Windows 11 23H2 and later experienced various symptoms stemming from this bug, including erroneous "Reconnect your drive" alerts despite compatible backup drives being connected and functional, the display of messages indicating that no previous version of files was available, and the failure of the "Last Backup" timestamp to update correctly. Microsoft acknowledged that these updates could prevent customers from successfully creating or updating their File History backups. The resolution for this issue was provided through a fix rolled out in the September 2026 preview update, along with optional cumulative updates, specifically KB5124006 and KB5124010, which addressed the fault for devices running Windows 11 26H1 and Windows 11 24H2/25H2, respectively. Microsoft recommended that users install the latest update to ensure important improvements and issue resolutions were applied. Alternatively, users who choose not to install the optional updates are advised that the fix will be included in the subsequent monthly Patch Tuesday updates scheduled for October 13. Furthermore, in addition to the File History resolution, Microsoft released out-of-band updates to correct other related issues stemming from the September Patch Tuesday security updates, including problems with Hyper-V, Remote Desktop Services failures, and USB audio issues. A temporary fix was also provided to resolve a bug that prevented some Windows 11 users from logging in using valid domain credentials after the installation of the same updates. The article was reported by Sergiu Gatlan. |