When you are determining which is the best way to back up for you, our belief is that the most important things on your agenda are reliability, and simplicity. That is why we have gone on to create what we believe is the most simple backup solution that can possibly exist in today's day and age - Mac Backup Guru. As for reliability, well, that's the other thing we're crazy about. In part the reliability comes from the simplicity. There is little room for misunderstanding the usage of Mac Backup Guru. Reliability is achieved internally in the design by using the same philosophy. For example: when you have already made a back up, and you go do the same back up at a later date in order to preserve your most recent changes made on your drive, this is the time that Mac Backup Guru will automatically sync only what has been changed.