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.