[bengalfreak]

this is sort of what the new enhance script does.
The only thing actually stored in /var anymore on an enhanced/zippered tivo is tivowebplus.
The rest of it is symlinks that get recreated if it's detected that /var has been wiped when tivo reboots.
So all you would really have to do to is re-install twp.
Edited to add...
My /var has been wiped exactly ONCE in a year on only one of my 2 Dtivos.

I have now experienced two /var wipes in six months. Not alot, but it is a pain.