Areca-Backup is an open-source, easy to use and relyable backup solution for Linux and Windows that performs incremental, differential, delta and mirror backups on local hard drives, remote directories or FTP/FTPs servers.
F. Mitzlaff, D. Benz, G. Stumme, and A. Hotho. Proceedings of the 21st ACM conference on Hypertext and hypermedia, page 265--270. New York, NY, USA, ACM, (2010)