I'm having trouble backing up some of my DVDs. I've decrypted some of my DVDs and some of them decrypt to be 6-8 gigs. that is obviously too big for a normal blank DVD-R. Do I need to compress them some how, get bigger DVD-Rs, or am I just doing something wrong all together? I'm using NERO 6 Ultra, but I doubt if that has anything to do with my problem. (My problem is lack of DVD back-up experience.
You can use a program called dvdshrink, here's a link to download: http://www.mrbass.org/dvdshrink/ Just open the folder containing the files that you have decrypted. DVD shrink will automatically reduce the size to fit onto a blank dvd. Press the backup button on shrink and the last tab on the window that opens up, make sure the box is checked off to enable burning with nero.
@livevil Another suggestion besides DegenX good one. If you have Nero than you probably have Recode. Will do the same as Shrink (same developer) just can't back up copy protected DVD's. Since they are already ripped to your hard drive you can use this guide: http://forums.afterdawn.com/thread_view.cfm/334154 Depending on what you used & what movie - the vobblanker part might be optional too. Vobblanker cleans out the 'junk' files and you can also 'blank' out what you don't want.