Full system protection backs up your entire computer. It will automatically back up everything on the hard drive that you boot your computer from.
If you have a second hard drive inside your computer, you can click the Modify button to add that drive to your full system backup.
When you enable Full System Protection, whenever your computer is connected to the local or network backup drive, Rebit Backup keeps your computer backed up by capturing changes “on the fly” as you work with your computer.
When your computer is disconnected from that backup destination, no backups occur. But Rebit Backup backs up changes to files on your computer as soon as you reconnect it.