Veeam incident
Microsoft 365 backup failures affecting OneDrive, SharePoint, and Teams
Resolved after 1 day 3 hours, affecting M365 - Asia Pacific and M365 - Europe, Middle East & Africa and 1 more, on October 13, 2026.
Microsoft has deployed a fix for the issue that caused some OneDrive, SharePoint, and Teams backups to fail with an “Unknown Error” in Veeam Data Cloud for Microsoft 365. We have confirmed that service functionality has recovered, and this incident is now resolved. If you experience any further issues, please contact Veeam Support.
Affected components
Update timeline
- investigating Oct 13, 2026, 06:06 PM UTC
We are investigating backup failures affecting OneDrive, SharePoint, and Teams across Veeam Data Cloud for Microsoft 365. Affected backups may fail with an “Unknown Error.” Our engineering teams are working with Microsoft to mitigate this issue.
- identified Oct 13, 2026, 08:25 PM UTC
Our engineering team has engaged Microsoft Support, who confirmed that the backup failures are related to a recent change within Microsoft’s services. Microsoft is actively working to resolve the issue. We will provide another update when additional information becomes available.
- resolved Oct 14, 2026, 09:36 PM UTC
Microsoft has deployed a fix for the issue that caused some OneDrive, SharePoint, and Teams backups to fail with an “Unknown Error” in Veeam Data Cloud for Microsoft 365. We have confirmed that service functionality has recovered, and this incident is now resolved. If you experience any further issues, please contact Veeam Support.
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