One thing that was fixed in the UR7 release for DPM 2016 was the error 40002 where DPM couldn’t mount the VHD containing the replica. This was a bit of a challenge for those people who had a very tight backup schedule or backups running 24x7 (which is maybe not the right way to set it up……).

The fix back then and the fix now is to reboot your DPM Server and restart your DPM jobs. I have provided this feedback to the PG and I’m grateful for all of you providing feedback via email etc. so we can help Microsoft understand what we need from them.