well, not that i'm endorsing an act such as "copying" DVD, which i'm sure many would agree to be highly illegal in 99% of dvds due to copyright cases.
But if you want to "Backup" a dvd, which is still illegal,
A program called "DVD Shrink" is what can be used.
It reads ANY dvd, and allows you to remove things such as the extras on the dvd, the multiple language options, and/or scenes of the movie. it also shrinks the dvd automatically to fit to the size of the dvd disc inserted.
I found Dvd X Copy to be somewhat useless on most dvds due to they're size like you said..
Once again, I am by no means endorsing the illegal copying of dvds and I am not responsible for any actions taken against any copyright laws.