So, I installed the Devuan beta a few days ago and it is great, rather it almost
mostly works. I probably need an audio driver installed. I want to see what
the old system had installed.

So I cleared out another partition and moved the backup of my Debian 8.3 onto
it. Ran update-grub, which found the backup in its new location.

But, when I try to boot it grub is confused and is pinned to the old UUID of the
root filesystem. (I have already updated /etc/fstab in the restored backup, but
it is not even getting that far.) It just dumps me into busybox saying it can't
find the root fs. Gotta love grub, which is useful only when nothing is wrong
:-)

Any advice about how to proceed?

Peter Olson