Backup history works fine on the old machine.
I don't recall explicitly changing my backup location, it seems every release I've upgraded has maintained it in the version directory/backups *except* when I upgraded to 22.0.2. In that case, it *left* the directory as .../21.0.1/backups! (I also ran beta on v22, but it was in a beta dir). So even while using 22.0.2 on the old machine, the backup history was still intact.
Browsing ...SlickEdit/vsdelta shows some files there, but much older, over a year old. The files under ...21.0.1/backups are dated as expected. Right up through the last file I know I edited.
So what I did was I copied everything in 21.0.1/backups on the old machine to the 22.0.2/backups directory on the new machine. I didn't realize it really wanted vsdelta, but my options are set to look in "backups" in 22.0.2 which is why I'm just expecting the history to just be there.
And like I mentioned, if I browse backup history, all the changes are in fact there (I've searched against specific files, like the last one I edited, and it knows about that change).
Would it help to move the files in backups to vsdelta instead?