@archw Could the results you are observing be due to the fact that some of the files weren't modified in the specific delta backup that you selected as your restore point?
For example:
In another subdirectory there are supposed to be 7 files but in the selection window there are only two.
When were these 5 "missing" files last modified?
Different use cases: Ceph is better with more hosts (at least 6 or 7 minimum) while XOSTOR is better between 3 to 7/8.
We might have better Ceph support in the future for large clusters.