Backup Hyper-V VM based on diffenrencing disks with DPM 2022

Hello,

I am currently backing up replicas of my Hyper-V VMs, which have differencing disks for the OS drive.

I have two VMs named VM1 and VM2 running on a Hyper-V cluster. Each VM is using a base VHDX file called SERVER-SYS.VHDX, and on top of this VHDX, there are two differencing disks, SERVER-SYS.diff1.vhdx for VM1 and SERVER-SYS.diff2.VHDX for VM2. Both VMs are successfully replicated to another Hyper-V cluster, and this replication process is working fine.

Now, I have set up a VM backup in DPM 2002 to back up the replicated VMs, specifically (RCT\VM1) and (RCT\VM2). The backup process itself is successful, and I can see the backups in DPM. However, when attempting to restore from the backup, I only find the SERVER-SYS.VHDX file under (RCT\VM1), and I am unable to locate the SERVER-SYS.diff1.vhdx or SERVER-SYS.diff2.vhdx files. Additionally, I have noticed that it is not possible to expand these volumes in DPM.

I am now wondering what exactly is being backed up by DPM. Is it only the SERVER-SYS.VHDX file, or are the differencing disks somehow merged together during the backup process?

Upon inspecting the replica file system, I can confirm that the server-sys.diffx.vhdx files are present, and they are correctly attached to the corresponding SERVER-SYS.VHDX (I have verified this using disk inspect).

I am uncertain whether DPM2022 is capable of backing up differencing disks. Could you please provide some insights into this matter?

Thank you.