.avhdx files exist but dont seem to be in use

Hi All,

I'm running HyperV on a Server 2016 cluster.

I have an issue where I have multiple .avhdx files stored with the .vhdx file.  I understand that .avhdx files are differential disks when a checkpoint is created.  I suspect that this was done by our backup software, but not removed properly. 

If I view the VM in Hyper-V manager I see the following:

• No checkpoints exist for the VM
• The VM HDD settings are pointing to the .VHDX file
• The .AVHDX files are not growing in size
• The .VHDX file is growing in size

By all accounts it looks like these .AVHDX files are not in use and can safely be deleted.  I would like a way to confirm that this is indeed the case.

Is anyone able to advise?

Thanks