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

Microsoft has fixed a bug that killed a backup feature, but it needs to regain the trust of users.

Microsoft warned that the built-in File History backup feature in Windows may stop working on some systems after installing the September 2026 security updates. By default, File History backs up all ...

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 has issued a warning to Windows users who rely on the File History that the backup feature may not function after installing the September 2026 Windows security update. The problem affects ...

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 ...

Windows users who rely on File History to back up and recover important files may bump into problems after installing the September security update. In its Knowledge Base support pages for the ...

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 ...