VSS snapshot timeout in April 2026 KB5083769 causing third-party backup failures on Windows 11
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Microsoft’s April 2026 KB5083769 security update is causing third-party backup applications to fail on Windows 11 versions 24H2 and 25H2 due to Volume Shadow Copy Service (VSS) snapshot timeouts. The update disrupts VSS operations used by backup tools from Acronis, Macrium, NinjaOne, and UrBackup, leading to failed backups and potential loss of cloud console connectivity. Users are advised to uninstall KB5083769 as a temporary mitigation.
Timeline
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30.04.2026 18:23 1 articles · 1h ago
KB5083769 causes VSS timeout leading to third-party backup failures on Windows 11
Microsoft’s April 2026 KB5083769 security update introduces a VSS snapshot timeout that disrupts third-party backup operations on Windows 11 versions 24H2 and 25H2. Affected backup software from Acronis, Macrium, NinjaOne, and UrBackup fails with snapshot creation errors, and some systems lose cloud console connectivity.
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- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
Information Snippets
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KB5083769 is a security update released for Windows 11 24H2 and 25H2 in April 2026.
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
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The issue stems from a VSS timeout during snapshot creation, affecting third-party backup software that relies on VSS.
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
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Affected vendors include Acronis (Cyber Protect Cloud), Macrium (Reflect), NinjaOne Backup, and UrBackup Server.
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
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Backups fail with the error message: "The backup has failed because Microsoft VSS has timed out during the snapshot creation."
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
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Acronis reports that affected systems may lose connectivity with the cloud console and appear offline.
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23
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Microsoft has not yet publicly addressed the issue; users are advised to uninstall KB5083769 as a temporary workaround.
First reported: 30.04.2026 18:231 source, 1 articleShow sources
- April KB5083769 Windows 11 update causes backup software failures — www.bleepingcomputer.com — 30.04.2026 18:23