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rsync --verbose --compress --recursive --perms [email protected]:/from/dir/ /to/dir
rsync -Pav -e "ssh -i $HOME/.ssh/somekey" [email protected]:/from/dir/ /to/dir/
# -e : ssh command e.g. -e "ssh -i $HOME/.ssh/somkey"
# -z : compress
# -v : verbose
# -h : human-readable numbers
# -r : recursive
# -P, --progress : show progress
# -a, --archive : archive mode; equals -rlptgoD (no -H,-A,-X)