lftp

• https://serverfault.com/questions/135618/is-it-possible-to-use-rsync-over-sftp-without-an-ssh-shell
• https://stackoverflow.com/questions/27635292/transfer-files-using-lftp-in-a-bash-script

lftp -u <user>,<pass> ftp://<site> << EOF
mirror complete .
bye
EOF