Update to the latest Cumulative Patch or major version (e.g., upgrading from v11 to v12).
This "mismatch" indicates a discrepancy between the information in the Veeam Backup & Replication configuration database and the metadata stored in the object storage repository. This may happen after upgrading Veeam or following storage-level changes.
In VMware environments, corrupt Change Block Tracking data can return massive, unrealistic block sizes to Veeam. Resetting CBT forces Veeam to recalculate the disk size safely.
: Occurs if the backup server's clock "time travels" (e.g., accidentally set to the year 1730), as SQL cannot handle dates before 1/1/1753. BigInt Overflow : Can happen in small environments using SQL Express if the database hits its size or data type limits. Resolution veeam backup and replication overflow error
: For Linux agents, this can often be fixed by modifying the veeam.ini file to increase the max snapshot space or changing the snapshot location to a drive with more free space.
Improperly configured scale-out repositories or lack of per-VM backup file chains. Concurrent Tasks
) or the pointer table can encounter an overflow. This is essentially a "logical overflow" where the complexity of the block-map exceeds the memory allocated for the merge process. This results in the common "Failed to generate points" or "Buffer overflow" errors during the merge phase, as the proxy cannot hold the entire map in its cache. 3. Resource and Buffer Overflows Update to the latest Cumulative Patch or major version (e
If you manage thousands of workloads, deploy Veeam v12+ using PostgreSQL, which handles massive configuration data scales better than SQL Server Express.
: High disk I/O can cause snapshots to grow too rapidly for the allocated space. 2. Arithmetic / UI Overflow (Console Bug)
Ensure that the WAN Accelerators and Repository servers have adequate scratch space on their SSD boot drives for metadata caching. How to Prevent Future Overflow Errors In VMware environments, corrupt Change Block Tracking data
If a single job contains dozens of high-capacity VMs, split them into multiple smaller jobs to distribute the metadata load. Preventative Best Practices
Several factors can contribute to an overflow error in Veeam Backup and Replication:
In , some catalog and proxy services had hard memory limits. To resolve: