Bash script using lftp to mirror local directory to remote directory, thus keeping the remote directory synchronized with the local one. This script uses mirror -R.

mirror_local_directory_to_remote_directory_(mirror -R)

#!/bin/sh
#  @author:       Simon Tipping
#  @description:  A script to mirror local folder to distant folder using lftp - Based on Alexandre Plennevaux's "MIRROR DISTANT FOLDER TO LOCAL FOLDER VIA FTP" script https://gist.github.com/pixeline/0f9f922cffb5a6bba97a
#
# FTP LOGIN
HOST='sftp://ftp.domain.com'
USER='ftpusername'
PASSWORD='ftppassword'

# DISTANT DIRECTORY
TARGET_DIR='/absolute/path/to/local/directory'

# LOCAL DIRECTORY
SOURCE_DIR='/absolute/path/to/remote/directory'

# RUNTIME!
echo "Starting upload $SOURCE_DIR to $HOST from $TARGET_DIR"
date

lftp -u "$USER","$PASSWORD" $HOST <<EOF
# the next 3 lines put you in ftpes mode. Uncomment if you are having trouble connecting.
# set ftp:ssl-force true
# set ftp:ssl-protect-data true
# set ssl:verify-certificate no
version
# see lftp manual for other options that may be of preference to your circumstances
mirror -R -e --parallel=3 --verbose=1 $SOURCE_DIR $TARGET_DIR;
exit
EOF
echo
echo "Transfer finished"
date