to the latest patch (v12.1 or newer fixes many arithmetic overflow bugs in CBT handling).
Veeam addressed multiple overflow conditions in versions 12.0.0.1420 P20230718 and later. Specifically, they patched the 64-bit to 32-bit casting error in the Merge process (Case #06032451). veeam backup and replication overflow error
: This occurs when changes made to the source machine while the backup is running cannot be written to the temporary "delta" or snapshot file. It is often due to insufficient free space to the latest patch (v12
Some users have found success by adjusting the MaxWorkItems or MaxMpxCt registry keys on the Veeam Proxy or Repository server, though this should only be done under the guidance of Veeam Support. Step-by-Step Troubleshooting Workflow veeam backup and replication overflow error
