Avamar Hyper-V Plugin: How to Check for Orphan Hyper-V VM Groups and Checkpoints on a Hyper-V Host

• Occasionally this automatic process may fail the deleted task due to environmental reasons. As a result, VM Groups and VM Recovery Checkpoints are left behind.
• These orphaned VM Collection Groups and VM Recovery Checkpoints may cause backup failures. The orphaned VM Recovery Checkpoints also consume space on the Hyper-V Storage. 
• In this scenario, work with your Hyper-V Administrator to remove the orphaned items from the Hyper-V node. Work with Microsoft Support if necessary. 

1. Check that no backups are running on the hyper-v client. This may be a federated client (for Hyper-V cluster), or a stand-alone client (for Hyper-V Node in a non-clustered environment).

• Check for any Hyper-V Plugin backup job in "Running" state within the Avamar UI "Activity screen" for the client in question.
• If there is a backup running, allow it to complete before proceeding with the next step.

2. On the Hyper-V Node, start the PowerShell as Administrator. Run the following commands:

• To list all VM Groups on the Node:

Get-VMGroup

• To list VM Checkpoints for all VMs on the Node:

Get-VM | Get-VMSnapshot

3. In a clustered Hyper-V environment, run the commands above on each Hyper-V Node (member of the cluster).