Just purchased Drive Backup 9 Personal and I am pretty happy with it except for one major thing. I took a full image of my C: to a network share which took a total of 10 min. The speed of the backup was excellent taking the same amount of time Acronis would. I then added a few folders accounting for no more then 500 megs and took a differential backup. The backup took 30 min .... What is the purpose of having a differential backup if the speed is that much slower then a full backup. Is this a bug or a performance issue? Also the program offers an incremental file backup that will work with the full image. Will this type of backup cover things like system registry and system changes or is it only data??