I cannot get Acronis True Image to do a differential backup. It either does not post an error message, only saying "backup failed", or says that "no command was executed because no command was set by default". This is after I go through the entire wizard telling it to do a differential backup. Their forums are full of customers having a wide variety of problems with the software, with either backups failing or restores not restoring, and there is very little help offered either in the software itself or by tech support. I emailed them with my problem 2 days ago and have heard nothing. It appears to be a "full featured" and user friendly problem but it's not the latter. It is buggy and even though you might have a whole library of backups I doubt it would restore data to a usable condition after a fatal crash. It is hard to believe that so many reviews place this at the top of the list. That can only mean that the list of products that do full image backups is very short and the rest of the products are complete garbage. This is an area begging for someone to come along and produce a product that really works and then back it up with some decent customer service. Apparently it's not out there now.