The April 2026 KB5083769 update causes VSS snapshot timeouts that break third-party backup applications on Windows 11 24H2 and 25H2, leading to failed backups and cloud console disconnects for some vendors. Affected products include Acronis, Macrium, NinjaOne, and UrBackup, and Microsoft has not yet issued a public fix; users can temporarily uninstall KB5083769 and pause updates to restore backup functionality. #KB5083769 #VSS
Keypoints
- KB5083769 causes VSS (Volume Shadow Copy Service) snapshot timeouts on Windows 11 24H2 and 25H2.
- Backup software that relies on VSS—including Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server—can fail to complete backups.
- Acronis confirms the issue affects Windows 11 Pro and Home and reports the error “The backup has failed because Microsoft VSS has timed out during the snapshot creation.”
- Temporary workaround: uninstall the KB5083769 update, pause Windows updates, and reboot the affected machine.
- Microsoft has not yet provided a detailed response; April 2026 updates have also caused other server issues such as restart loops and BitLocker recovery prompts.