KB1775: Removing Stuck VMDK’s from the Veeam Proxy
https://www.veeam.com/kb177520.06.2013 · A VM that Veeam processed is found to have an orphaned snapshot. Cause This may occur Virtual Appliance Mode (HOTADD) is used to back up a VM, and is caused by: VMware does not process the command to release the virtual machines's disk from the proxy. The Veeam server crashes while processing a virtual machine.
KB1065: Job fails with error "The create snapshot ...
https://www.veeam.com/kb106519.07.2011 · The snapshot cannot be created if the "Enable VMware tools quiescence" option is enabled in the job's properties. The same operation fails when trying to take a Snapshot via vSphere client with the option "Snapshot the virtual machine's memory" unchecked and the "Quiesce guest file system (Needs VMware Tools installed)" option enabled.