I am evaluating a trial version, and have a few questions: 1. My "C" drive has 13GB of data, a full backup has 7GB. Am I correct the difference is due to compression? 2. After performing a full backup I perform sequential differential backups. The first differential has approximately the same file size as the original full backup. The next few differentials have a much smaller file size. Why does the original differential backup contain so much data if it is only backing up data changed from the original backup? Each additional differential does not ovewrite the prior one, but is listed as a separate backup ((1), (2), (3), etc.) which seemd more appropriate for a sequential backup rather than a differential. Is this the proper protocol? Any help would be really appreciated since I am reluctant to purchase if these issues are problems. Thanks!!!