One interesting open-source solution is Areca: http://www.areca-backup.org/ http://www.areca-backup.org/ Multi-platform, encrypts, compresses, incremental/diff

One interesting open-source solution is Areca: http://www.areca-backup.org/ http://www.areca-backup.org/ Multi-platform, encrypts, compresses, incremental/differential backups to FTP, network drives, local drives, usb sticks and it has a GUI.