https://www.digitalocean.com/community/tutorials/how-to-use-rsync-to-sync-local-and-remote-directories-on-a-vps http://digitalpbk.com/linux/automate-rsync-passwordless-daemon-rsyncd-conf-cron http://www.thegeekstuff.com/2011/01/rsync-exclude-files-and-folders/
rsync -a username@remote_host:/home/username/dir1 place_to_sync_on_local_machine
rsync -a --delete source destination
rsync -a --exclude=pattern_to_exclude source destination