#!/bin/bash
PORT=222
for BACKUP_SERVER in sauvkipeu.libre-en-communs.org gardefou.libre-en-communs.org; do
    rsync -aq -e "ssh -p ${PORT} -i /root/.ssh/backup_ssh_key" --numeric-ids --update --delete --delete-after --exclude '/dev/' --exclude '/proc/' --exclude '/sys/' / borg@${BACKUP_SERVER}:/mirror/
done

# Don't be afraid by the rsync destination. The authorized_keys in backup server contains a rrsync restriction which fix the good directory.