Some things to beware of. It is likely the partition was
not idle at the time of back up so it is not 'quite' a
snapshot.

Have the new disk mounted on a different machine
or boot the old machine off a KNOPPIX disk. You do not
want to be running at the same time you are restoring.
Probably the way you want to do this is build a new
system using the same install CD you used originally
so that your backup is essentially just the 'upgrade'.

You want to your rsync to not just update, but also
delete from the target so that you are mirroring.

Even then be prepared to perform some minor Unix
magic, just in case. UUID's were already named. Be
careful about the restore of /dev as I have sometimes
had rsync barf on that; also be wary of files that
get linked in a circle.

Places where things can get screwed up are probably
few, given that the new machine is the same as the
old... if not the number of tweaks increases a bit,
but you can clear the little things up over time. A
new mother board probably means new drivers. There
might be old mappings in in the udev sticky rules
that could bite you by making your new eth0 be eth2
or some silliness.

Good luck, and good hunting. I've rebuilt more than
one root partition from scratch and it can be
interesting, for small values of interesting...




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