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You can backup a lot of data onto a single DVD. Perhaps sound-files, graphics, photos, presentations or even your $HOME directory. You can also author a digital movie on a DVD to play on household DVD players or on computer DVD drives. A Linux Journal article on DVD authoring might get you started on the subject of DVD video authoring. There are several tutorials and howto's on creating DVD-video. In general you might want to use dvdauthor. There is a tutorial on using dvdauthor at 'thoughts on DVD authoring'.
Since most of the time DVDs are used for data purposes here are some guidelines: