Symptoms
The system cannot find the file specified. (\\192.xx.xx.xx\E$\Virtual Machines\Snapshots\2DBB9E48-FB8B-445A-8B8A-5258712C6D61.xml)
The system cannot find the file specified. (\\192.xx.xx.xx\E$\Virtual Hard Disks\Server_B833B6BD-A6B9-4272-9BC9-E90954C86FCA-AutoRecovery.avhdx) This is an issue addressed by Microsoft patches.
The operating system event log (System and Application) on the Hyper-V host and inside the backup source virtual machine provides the Windows related events.
Solution
https://support.microsoft.com/en-us/kb/3135020.
2.Uncheck "Backup (volume checkpoint)" option (default is checked after the operating system is installed inside the virtual machine):
a) Start the Hyper-V Manager and connect to the Hyper-V host.
b) Right-click on the backup source virtual machine > Settings.
c) Go to Management > Integration services, deselect the option "Backup (volume checkpoint)".