KB1790: Veeam Backup Temporary Snapshot
https://www.veeam.com/kb179009.07.2013 · A snapshot named VEEAM BACKUP TEMPORARY SNAPSHOT is found on a VMware Virtual Machine. Cause As detailed in the Veeam Backup & Replication User Guide, a snapshot is created on a VM that is being processed by a Veeam job. This creation of this snapshot causes the VM's base disks to be in a read-only state during the job's read operation.