Windows 11 machines that installed KB5124008, the mandatory September 8, 2026 security update, began failing to back up files through File History without ever showing an error that said so plainly.

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 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 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 ...

A bug in the Windows Sept patch Tuesday update may stop File History from working. But a new optional update fixes it. Windows users who rely on File History to back up and recover important files may ...