REGARDING CASPER I have a 500g hard drive, partitioned into two 250g drives. Drive C has 40g and drive d has the operating system 3 gig total. My backup drive is 160g. I attempted a backup of the whole drive and get the message that there is not enough space available. I can backup C drive by itself, but when I try to backup D will it write over the copied C drive. There should be plenty of unused space. any casper users out there?