What is the best format to save my movies in an archive in my computer that would take up the least space?
How much loss in quality are you willing to accept?
Divx is the way to compress movies to a relative small size, but you will have to accept some loss in quality. Divx can be several formats, from wmv, avi to asf…
I’d check out this section of our forum if I were you: http://club.cdfreaks.com/forumdisplay.php?f=66
And it is gonna take a few/several hours to process each movie, so that may be something to consider depending on the size of your collection.