A bug in the Windows Sept patch Tuesday update may stop File History from working. But a new optional update fixes it.

[File History (known issue)] Fixed: This update addresses an issue where File History might fail to back up or restore files to an external drive or network location. Affected devices might ...

Even if files on your desktop or in your documents disappear after a Windows update, they may still remain in a different user profile or the "Windows.old" folder. If you have a backup, you can also ...

Microsoft has confirmed a regression in its September 2026 cumulative security updates that breaks File History, the built-in backup feature in Windows 10 and Windows 11. The bug causes local and ...

Microsoft has fixed a known issue that breaks the built-in File History backup feature on some Windows systems after installing the September 2026 security updates. In a Saturday service alert seen by ...

Microsoft added this under the heading “Known issues in this update” in the associated Knowledgebase entry, but the error description does not yet appear in the ...