Hello. I have the single disc edition. To do a full backup, even with things ommitted, the compression percentage was somewhere in the low 50's.
Since I'm a big fan of the movie, I'm gonna use DVD Rebuilder on it. Latest AnyDVD to rip > VOBB to blank the unwanted on a DVD > Shrink to compress > ImgBurn to burn = Never starting a thread asking how to backup a movie