I apologize if this has been discussed before, but I spent quite a bit of time trying to find this answer to no avail. I understand that if a hard drive is defragged, an incremental image backup taken after the defrag will be very large. My question is: if I take a file backup ("My Data" backup) instead of a partition/disk image backup ("My Computer" backup), does file backup only backup the files that were changed since the last backup, so it is not affected by defragmentation? For example, if I take a Full file ("My Data") backup, then I change one and only one file, then do a defragmentation, will the next incremental file backup only backup one file? I like keeping my disks defragged. I was wondering whether I need a more traditional (i.e. non-imaging) backup program to handle my "Documents and Settings" folder, and use ATI just for my Windows and Program Files partitions. But, if ATI can behave like a traditional (non-imaging) utility for my data files, then it has the best of both worlds: imaging, and traditional file backup. This distinction is discussed in the ATI manual, but it's just not clear to me whether or not defragmentation affects file (non-image) backups. Thanks.