Use freeware DVD Shrink and read this guide on how to make 1 DVD backup out of 2 DVD's -
http://www.doom9.org/mpg/dvdshrink31-multidisc.htm
Tip: Before you try this, learn how to use DVD Shrink effectively for single DVD rips, especially how to get rid of unwanted audio tracks and video extras, replacing moving menus with stills etc.. All guides at Doom9.net are excellent. Also check out the DVD Shrink forum at Doom9.
Use freeware VobSub to rip subs. Useful when you want to convert to mpeg4 (divx/xvid etc) with subs.
Keith