u cannot backup dvd's directly.
you have to decrypt DVD's on your hard drive (will take 17-19GB space)
then you have to encrypt to writeable DVD, using DVD encrypter.
u can find DVD encrypter from this site, and as well they'll refer you to some toerh sofwares that can encrypt DVD to DVD-R drive.
* also, processing 1 DVD takes a good time, unless u have got rreally fast system.
the web site is.