Conditions when DPM cannot backup a Hyper-V VM

We recently saw a situation where a running VM could not be backed up by Data Protection Manager.

Here is why:

If at least one of the following conditions is true

• The Hyper-V integration components for volume snapshot copy disabled for the VM
• Dynamic disks configured inside of the VM
• Non-NTFS based partitions inside the VM
• Changed shadow storage assignments within the VM
• VM is not in running state.

In such a case, the VM is put into saved state before the host volumes are snapshotted for back up. For such VMs, Hyper-V writer reports the VM datasouce name in the format "Backup Using Saved State\<VMName>". If online backup is possible for a VM, the format will be "Backup Using Child Partition Snapshot\<VMName>".