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.
Morning Overview on MSN
A September Windows update quietly stopped backing up people’s files
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.
[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 ...
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