Tried copy/paste in finder - copied root-level folders, then seemed to take forever. So I stopped, deleted the folders, and tried again on command line ```cp -R old-drive new-drive``
In one hour it copied 3.2 GB of files.
Given my 660+GB of files on this drive, that’s over 10 days of copying. So now I’m going to try copying individual folders, see if I can find out where the problem is. Obviously, the main problem is that I formatted my old drive to APFS like an idiot. But since any reformatting would still involve copying the data off, I’m kinda stuck. Will report back on progress.