I've been a long tome Acronis True Image user but only for full backups whenever I deemed them necessary. Well, I want to make better use of the product and want some advice. My system is fairly old but I keep my copy of XP and my software up to date at all times. In doing so, I find that my HD gets fragmented so I end up defragging quite often with PerfectDisk therefore the heart of the question.... If you defrag frequently is there any advantage to doing incremental or diferential backups over doing more frequent full backups? If there is still value in doing an incremental or differental backup which one is better - incremental of differential if you are doing frequent defrags?