The FREE Edition is for home users and small companies who have 2 desktop or laptop computers to back up. It comes with 2 AhsayACB and 1 AhsayOBS. The Business Edition contains AhsayOBM license which is server grade backup client. If the AhsayOBS backup server and the client computers with AhsayACB installed are on the same network, AhsayACB will automatically pointed to the AhsayOBS and you can start doing backup right away. If the AhsayOBS backup server is located offsite, you need to enter the IP address or the domain name of the AhsayOBS in AhsayACBs in order to have them correctly connected to the AhsayOBS. In case you need more than 2 client access licenses of AhsayACB, follow the "Buy Licenses Online!" linkage located at the bottom right hand corner of AhsayOBS to purchase a package of Ahsay? Backup Software Business Edition.