Do not trust this company. I purchased Tri-Backup years ago, then there was an OS update, and Tri-Backup vanished. It was a completely dead product. There were no updates for literally over 5+ years. Then, all of the sudden, they reappear from the dead, and start making updates again, and all of their customers that they let hang out to dry are expected to pay to get their application working again, that they already paid for, and it never worked in the first place. There is no customer loyalty at all. They could just vanish off the face of the earth again at any time. I have been using ChronoSync ever since, and it has been great with amazing support and upgrade policies.