#!/bin/sh
HOST=serveur.test.fr
USER=login
PASSWD=mot de passe
REPERTOIRE_DEST=/mnt/HD/HD_a2/sauvegarde
REPERTOIRE_SOURCE=/source

cd $REPERTOIRE_DEST

lftp<<END_SCRIPT
open sftp://$HOST
user $USER $PASSWD
cd $REPERTOIRE_SOURCE
mget *
bye
END_SCRIPT