Backup of SharePoint site fails with "Failed to backup list User Information List. Unknown Error"
| KB ID: | 4326 |
| Product: | Veeam Backup for Microsoft 365 | 6.0 |
| Published: | 2022-06-15 |
| Last Modified: | 2022-06-15 |
Challenge
Backup of the "User Information List" SharePoint list may fail with "Unknown Error"
Cause
Veeam is working closely with Microsoft to investigate this situation.
The hotfix on this KB article was generated to improve the handling of the additional query result data causing this issue.
Solution
- Ensure you are running Veeam Backup for Microsoft 365 build 6.0.0.385 (P20220524)
- Ensure that there are no Backup jobs or Restore sessions running.
- On the Veeam Backup for Microsoft 365 server, stop the following services:
- Veeam Backup for Microsoft 365
- Veeam Backup Proxy for Microsoft 365
- Download the hotfix via the button below.
- Extract the fix to: C:\Temp\KB4326\
- After extraction, unblock the files using the following PowerShell cmdlet:
Get-ChildItem -Path "C:\Temp\KB4326\" -Recurse -Force | Unblock-File- Back upEither zip the old dll or rename it to add .kb4326original after the .dll extension. and replace the the DLL file in each of the following locations:
- Veeam.SharePoint.Engine.dll
- C:\Program Files\Veeam\Backup365\
- C:\Program Files\Veeam\Backup and Replication\Explorers\SharePoint\
- Veeam.Archiver.Source.dll
- C:\Program Files\Veeam\Backup365\
- C:\Program Files\Veeam\Backup365\Packages\Proxy\
- Veeam.SharePoint.Engine.dll
- Start the services that were stopped in Step 3.
- Upgrade the Backup Proxy Servers.
Download Information
MD5:
SHA-1:
9875DCB44B8DDE6F75F35D02F71A242E
SHA-1:
BF5E2BD0F37BA23EA4E098C8CEDB7173FD60B546
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