Microsoft: September updates break File History backup feature
Microsoft September 2026 updates break Windows File History backup feature.
Microsoft has warned that its File History backup feature in Windows may cease to function after users install the September 2026 security updates. Affected systems may experience backup failures, incorrect "Reconnect your drive" messages, and an inability to access previous file versions. This issue impacts various versions of Windows 10 and Windows 11.
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The lesson from this incident
Full lessonMicrosoft's September 2026 security updates introduced a regression that disables the File History backup feature across Windows 10 and Windows 11, leaving users without functional backups and unable to access previous file versions. This highlights a critical risk where the very act of patching — essential for security — can inadvertently undermine data protection capabilities. Organizations relying solely on File History as their backup strategy are now exposed to potential data loss during the window between the broken update and a fix. This incident underscores why backup systems must be independently verified after every major update cycle, and why redundant backup strategies are non-negotiable.
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- Automated patch management
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Indicators of Compromise
Extracted by AI from the linked source. Not reviewed by an editor. How this works
- malware — FileHistory.exe