Backup/restore strategy

[Jim Byrnes]

Getting ready to do a dist upgrade from 12.04 to 14.04.  I did a test 
run on my laptop and except for a couple of minor glitches it seemed to 
go well.

When I do my desktop I want to be sure I can easily restore the system 
to its condition before I tried the upgrade. I use BackInTime (root) for 
my backups. I backup everything except cdrom, dev, lost&found, media, 
mnt, proc, run, sys and tmp to an external usb drive.

If something goes wrong can I re-install 12.04, install back-in-time and 
restore from the usb drive. Telling it to over write everything and end 
up with 12.04 just like it was before the attempted upgrade?

Regards,  Jim