fixes and set preferred_ip since new interface eth0

ansible/arcodange/factory/playbooks/backup/postgres.yml

@@ -33,6 +33,7 @@
         content: |
           #!/bin/bash
           set -e
+          mkdir -p {{ backup_dir }}
           {{ backup_cmd }} | gzip > {{ backup_dir }}/backup_$(date +\%Y\%m\%d).sql.gz
           find {{ backup_dir }} -type f -name 'backup_*.sql.gz' -mtime +{{ keep_days }} -delete