I use Winzip to zip up Geometries, libraries, etc separately. (currently around 6.5gig total). It's just a matter of putting all the pieces back together later. I have found CD-R to be a reliable medium. I have have some very flaky results using DVD-R/RW disks - they sometimes have difficulty with nested files giving a lot of zero byte folders. Until they are more reliable I should stick with CD-R's or invest in a second hard drive.