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By Susan Bradley
This is a trending story.
On the same day I sent out an MS-DEFCON Alert recommending installing the April updates, Ira Shapiro alerts us to issues with backup software. I’m not seeing this with all backup software, but some vendors have mentioned the matter in various forums.
The problem with KB5083769 (the Windows 11 24H2 and 25H2 April update) is serious enough that I’m raising the MS-DEFCON level to 3.
As usual, don’t panic. The problem does not affect all backup software. Check your system first before following my recommendation below, and consult your vendor’s site for its updates.
Here’s a sampling of posts from some of the vendors.
- Urbackup is having issues and recommends uninstalling KB5083769 if you are impacted.
- Macrium is reporting issues with Reflect in a Reddit thread.
- Acronis posted a support note indicating that it is investigating. However, the note also recommends uninstalling KB5083769 and rebooting.
If you are impacted:
- Go to Settings | Windows Update | Update history.
- Scroll down to the end and find the section Related settings.
- Click on Uninstall updates.
- Look for Security update for Microsoft Windows (KB5083769).
- Click the uninstall link on the right.
- Return to Windows Update.
- Pause updates.
The error appears to be with the Microsoft Volume Shadow Copy Service (VSS). This vital Windows component is used with many backup and restore solutions. However:
- It is not used with the Windows 11 cloud-based Backup feature.
- It is used with the forthcoming point-in-time restore (PITR) feature in Windows 11 (KB5070307).
PITR began its rollout in November during Microsoft Ignite; KB5070307 was an Insider and Dev build. It has not yet reached general availability and thus should not pose any risk for most users.
Hope you enjoyed this news post. Feedback welcome.
Posted Thursday 30 April 2026 at 7:38 am AEST (my time).
News posts: 2023 5,800+ | 2024 5,700+ | 2025 5,700+ | 2026 (to end of March) 1,297
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