Convert Mac OS Extended (Journaled) Time Machine contents to APFS

Solution 1:

If clicking the date doesn't move to that date, it's because there is no backup for that selected location. It doesn't mean there's no backup at all.

See this image…

I have backups only for my boot drive. Other drives have been removed from Time Machine's backup prefs. If I start from 'Now' then all the drives show in the list on the left. As soon as I scroll back, then the other drives grey out, because there's no data [Acronis is an NTFS volume & Time Machine doesn't know what to do with that].

So, to see what's really there, start from your boot volume & go backwards from there. At each step some locations may grey out, but the boot drive itself should have data going back in time.