Ok. I am not sure if you understand it. Let's say I need to restore a file in day 3 snapshot, and this snapshot is missing from Primary. Can I then restore the file from day 3 snapshot from DR? when the schedule snapmirror kicks off, the snapmirror will also replicate all local daily SnapShots over to DR, and that's why DR keeps all SnapShots on Primary.
Hope I made myself clear this time.