Veeam Backup & Replication is renowned for its reliability, but like any sophisticated software, it occasionally throws cryptic errors. One of the more frustrating and misleading messages is the generic "Overflow Error" (or variations like Overflow while performing operation, Arithmetic operation resulted in an overflow, or String field overflow).
Always test in a non-production environment first. veeam backup and replication overflow error
(Or the custom path set in Veeam settings) Troubleshooting the "Overflow Error" in Veeam Backup &
Cue the explosion.
The Problem: A financial services firm running Veeam 11 on Windows Server 2019 with a 50TB ReFS repository. Every Thursday, their primary backup job failed at 3:00 AM with "Overflow error" exactly at the 45% mark of the synthetic full creation. Open Device Manager on the Veeam proxy or host