Most of the posts I've read talks about compressing DVDs to fit onto one DVD-R. I have severnal children DVDs that I'd like to back up before they are destroyed. Many of these are less than 2 GBs. Is it possible to put two of such DVDs onto one DVD back up? If so, how? I'm new to backing up DVDs, but I have successfully backed up DVDs that are both under 4.7 GB and over 7 GB.