I have a 500GB drive that I use for my OS (Windows XP Pro) and all of my programs, all on a single partition. I have another 500GB drive where I keep all my data files, pictures, music etc, which I would also like to use to keep images of my full backup. However, I don't want to take any chances with my data on this second drive. What kind of full image size can I expect of a 500GB drive, and do you think it is OK to store the 500GB drive image backups on a 500GB drive that is also used for all my data This second drive currrently has about 100GB of data, so it currently has about 400GB space for the Acronis image backups. Thanks for any help!