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Windows 11 KB5083769 Update Causes VSS Failures in Backup Software

· Original article ↗

Summary

Reports and Acronis support information say Windows 11 update KB5083769 causes VSS timeouts that can fail third-party backups on versions 24H2 and 25H2. Uninstalling the update is a temporary workaround; Microsoft had not responded.

Key points

  • User reports say KB5083769 causes Volume Shadow Copy Service (VSS) snapshot timeouts on Windows 11 24H2 and 25H2, disrupting backup software that relies on VSS.
  • Affected products include Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server.
  • Acronis confirms failures on Windows 11 Pro and Home, and says affected machines may also lose cloud-console connectivity.
  • The reported temporary workaround is to uninstall KB5083769, pause Windows updates, and reboot.
  • Microsoft had not provided a response when the article was published.

Article Details

Event Type
Windows 11 security update causing third-party backup software failures
Impact
KB5083769 causes VSS snapshot timeouts on Windows 11 24H2 and 25H2, preventing affected backup applications from completing backups. Acronis also reports that some affected machines may lose connectivity with its cloud console and appear offline.

People

Susan BradleyThe article says user reports of the backup issue were first spotted by Microsoft MVP Susan Bradley.

Vendors

AcronisAffected 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.MacriumAffected 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.MicrosoftAffected 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.NinjaOneAffected 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.UrBackupAffected 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.

Products

Acronis Cyber Protect CloudBackup software that relies on VSS—including Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server—can fail to complete backups.Macrium ReflectBackup software that relies on VSS—including Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server—can fail to complete backups.NinjaOne BackupBackup software that relies on VSS—including Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server—can fail to complete backups.UrBackup ServerBackup software that relies on VSS—including Acronis Cyber Protect Cloud, Macrium Reflect, NinjaOne Backup, and UrBackup Server—can fail to complete backups.Windows 11 24H2The 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.

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