Sync data between server

source

• https://www.digitalocean.com/community/tutorials/how-to-use-rsync-to-sync-local-and-remote-directories-on-a-vps
• http://www.cyberciti.biz/tips/how-do-i-sync-data-between-two-load-balanced-linuxunix-servers.html
• http://www.tecmint.com/rsync-local-remote-file-synchronization-commands/