Conceptually I'm looking for something like dar, but I don't want it to make a special archive format, I'm just looking for a program that given a huge list of files in a directory tree will break them out into sections that will fill most (up to and including but not over) a measure of space like a DVD. So what I'd be left with is a pile of DVDs with my original directory structure and all the files that would fit on one disc. So if I were to do a regular file copy of all the DVDs back to a file system I'd have what I started with. Brasero for example says it will do it but doesn't actually seem to do it. Linux better but windows acceptable.
P.S. I just found something called DVDspan. The only problem is when I run it, it blows up with an out of memory error. But that's exactly what I'm looking for.