Merging 2 DVDs

I like to backup a movie but the movie consists of 2 DVDs.
Is there any way I can merge them into one single-layered DVD ?

I have both Nero and DVDFab. I asked similar question in both Nero and DVDFab forums. I like to know my options.

Please don’t crosspost.

Question already answered here:
http://club.cdfreaks.com/showthread.php?t=187375