Rsync and SSH

rsync --help

Options
 -v, --verbose               increase verbosity
 -a, --archive               archive mode; equals -rlptgoD (no -H,-A,-X)
 -r, --recursive             recurse into directories
 -n, --dry-run               perform a trial run with no changes made
 -e, --rsh=COMMAND           specify the remote shell to use
...
 -c, --checksum              skip based on checksum, not mod-time & size
 -u, --update                skip files that are newer on the receiver
 -z, --compress              compress file data during the transfer
 ...
 

PULL FROM REMOTE HOST (DOWNLOAD):

rsync -ravz -e ssh [email protected]:/opt/ /home/user/directory/

rsync -avz -e "ssh -A -i /home/user/.ssh/id_rsa" [email protected]:/opt/data /home/user/projects/data

PUSH TO REMOTE HOST (UPLOAD):

rsync -u -ravz -e ssh /home/user/directory/ [email protected]:/opt/

rsync -avz -e "ssh -p 10010" /home/user/directory/ [email protected]:/opt/