You can back this title up with the menus and extra stuff. However, it's not worth doing in this particular case because they take up a LOT of space. Probably best to use the menu, deleted scenes, and movie only (extra stuff in BS is freakin huge).
DVD shrink may be screwing up in this particular movie with a silly anti-pirate thing built in (one example is a loop of a kid with a soccer ball or something). You can either use the most recent dvd shrink to see if it can get around that automatically, or use DVD shrink to put a still image in place of the particular offending part, or try using VOB Blanker (DVDRHELP.com has a guide on this prog). Or, simplest, just use the re-author option in dvd shrink and compress only the movie itself to 4.5 gigs.