My name is Luwen Zhang from Vinchin Backup & Recovery. 

I'm sending you this Email because our developers encountered some problems while developing incremental backup feature following the oVirt documentations.

We downloaded oVirt 4.4.1 from oVirt website, and is now developing based on this version, as per the documentation when we perform the first time full backup, we should obtain a "checkpoint id", so when we perform incremental backup using this ID we should know what's have changed on the VM. But now the problem is that we cannot get the checkpoint ID.

The components and versions of oVirt are as follows:

Could you please kindly check on this issue and point out what should be wrong and what we should do?

Looking forward to your reply.