Best Software to edit DVD movies before burning

[Mr Blue]

Let me be more specific!!! I want to backup my DVDs 1:1. so i bought a DVD-ROM and a DVD-R/RW. I cant find DVD media over 4.7g.....SO..... i guess ill have to edit them down to 4.4 to fit on a 4.7g DVD-R...unless someone knows where i can get 9g DVDs. Whats the best software do i use to edit movies??? Thank You