Error Message 10106
Host-Based VM Backup does not support the protection of Windows 2008 R2 Hyper-V cluster virtual machines. You need to upgrade your Hyper-V host to a Windows 2012 operating system or later.
Symptom
Hyper-V 2008 R2 cluster is not supported by agentless backup of UDP.
Solution
Upgrade to Hyper-V 2012 or later.