Well. i use clonedvd 22.214.171.124 for making a backup to a dvd+rw first to see if the movie has no bugs before I burn it to a dvd+r, clonedvd doesn't have spyware in it.
Dvd x copy has an anoying 321 warning screen in it (this is an invisible watermark on which one can see who purchased the program) You can remove it simply with vobrator and ifoedit.
Both have good quality. Only they should work on the matter of being able to make an backup of an backup without hangs or freezes.