What kind of problems are you encountering? Early on I had problems understanding the procedures, but after a little while I was able to run with it.
This is the way I do it, and it works for me:
1.- Create 3 folders for the back up
2.- In one of them, in this example let's call it folder Dave, place dvdmanDAVE's command. Execute it.
3.- Use either dvd2one, or dvdshrink to compress the films to fit one dvd. Each movie in its own folder
4.- Run IFO edit and load your first movie and run get VTS. Once this is performed, close ifo edit, and open the folder where you placed movie 1. Change the VOB 1_O to 2_0, 1_1 to 2_1, etc. and move the vob files only, not the video_ts files, to the folder where you have executed dvdmanDAVE's file. (Folder Dave)
5.- Run IFO edit on movie two, Change the 1_0 to 3_0, 1_1 to 3_1 etc. Move the vob files only, not the video_ts files, to the folder where you have executed dvdmanDAVE's file.
6.- Open IFO edit load the files of folder Dave, and run Get VTS, and that is it. What I do next is to I burn it with Nero.
Believe me, it works, and once you get the hang of it you will see how easy it is to run.
Hope this helps