Veeam Microsoft 365 Community Edition Corrupt adb.log file corrupt

You are best to wait on support but this might help - https://satheesh.net/2021/05/veeam-backup-for-microsoft-office-365-jeterror-501-jet_errlogfilecorrupt-log-file-is-corrupt/

Veeam describe the support model for the community edition as best effort with no Service level agreements. 
what this means in reality is, support will eventually answer your question, but they only when they aren't dealings with higher priority or paid support tickets. 
 

Thanks, this is some great information to have.  I did go through this and check that the repository itself is fine but the issue is the log file itself.

[07.03.2026 00:00:02.160]           3 (6)       [Info] Invalid repository status is returned (repository ID: 2d501c21-62e3-46c0-a0e7-2b4970a33307, is outdated: False, is out of sync: False, is out of order: True, out of order reason: JetError -501, JET_errLogFileCorrupt, Log file is corrupt)

I run the backups once a day to SATA platter style (non solid state) drive.  I’m wondering if the file is fragmented and if I should be moving to a solid state drive.

Moving to SSD would help for sure.  

adb.log is part of the Jet (ESE) transaction log used by the Veeam M365 repository database.

Disable all the Veeam services and try to run soft recovery to replay the transaction logs into the database:

eseutil /r adb /l "<log folder path>" /d "<database folder path>"

Then check the database state to see if it’s Clean Shutdown 

eseutil /mh repository.adb

If logs are too damaged to replay, you can run a hard repair:

eseutil /p "<database path\repository.adb>”

This should allow the database to mount again if the corruption is limited to the transaction logs.