This document covers using cron, ssh, and rsync to backup files over a local network or the Internet. Part of my goal is to ensure no user intervention is required when the computer is restarted (for passwords, keys, or key managers).
http://troy.jdmz.net/rsync/index.html
Rsync is a wonderful little utility that’s amazingly easy to set up on your machines. Rather than have a scripted FTP session, or some other form of file transfer script — rsync copies only the diffs of files that have actually changed, compressed and through ssh if you want to for security.
http://everythinglinux.org/rsync/
Probably the most secure and fastest FTP server for UNIX-like systems.
https://security.appspot.com/vsftpd.html