Well personally I would just do a clockwork backup like the previous guys said, and then advanced restore my data onto the new rom. I've been doing this with Rom installs for 2 years and it's always worked pretty well.
Anyways, if you really wanted to use TB that bad to do it, I would go into your SD card folder, copy the TB folder onto the computer (All your old backups you don't want to get rid of would be in here) Delete the TB Folder on your SD card, then re-run TB again. Do a batch backup of all your apps (that you have currently installed). If you ever want any of the old backups of apps you don't currently use, they'll always be on the computer.
Currently melting faces on my T989 with:
- AOKP (ICS until JB Bugs are worked out)
- Venum newest (or whatever is current)
- Cobalt CM10/AOKP (Depends on the day!)
- Cm10. Just in case I get bored...
Also just got ahold of a N7 16gig! Time to really have some fun now!