For me personally, the instructions did not seem to sufficiently explain some of the features and the trouble thereby that results. It took a while to figure out how to create a bootable clone for example. It wasn't clear that it required it's own partition. And to restore the clone elswhere required that the clone be cloned to it's destination to be bootable, not "restored." I also had a problem with not sufficiently understanding what would happen to the rest of the files/folders on my external HD when I performed versioned backups. They disappeared into a double secret area that required a call to tech support.

However, the customer service/tech support is excellent, and by the way, not out-sourced. I used them yesterday to resolve the versioned backups issue. John couldn't have been more technically proficient, patient responsive, interactive. It took some time and was a little tedious but the issue was completely resolved and I now know more about how the software works.
The functionality of the product is excellent and other than issues directly related to my lack of understanding, Data Backup works as described by Prosoft.