diff --git a/roles/smb-backup/files/backup.sh b/roles/smb-backup/files/backup.sh
index 24a32e4..027d791 100755
--- a/roles/smb-backup/files/backup.sh
+++ b/roles/smb-backup/files/backup.sh
@@ -1,27 +1,51 @@
 #!/bin/bash
+
 BDIR=/home/backup
 SWIN=/tmp/s-win
+LOCK=/tmp/s-backup.lock
 
+#Fonction cleanup pour sortir propre dans tout les cas
+cleanup()
+{
+  rm "${LOCK}"
+  umount "${SWIN}"
+  echo "nettoyage effectue, sortie tout propre ..."
+  exit 3
+}
+
+#check si pas deja en cours d execution > sortie si fichier de lock existe
+if [ -e "${LOCK}" ] ; then
+	echo "$0 : Verrouillage, deja en cours d execution"
+	trap cleanup 1 2 3 6
+fi
+#prepartion des dossiers qui vont accueillir les donnees à sauvegarder
 [ -d "${BDIR}" ] || mkdir "${BDIR}"
-[ -d "${BDIR}" ] || mkdir "${BDIR}/s-win"
+[ -d "${BDIR}/s-win" ] || mkdir "${BDIR}/s-win"
 [ -d "${SWIN}" ] || mkdir "${SWIN}"
 
-mount -t cifs -o ro,vers=3.0,username=u-backup,password=Azerty1+ //s-win/commun "${SWIN}"
+#etablissement du lock
+touch "${LOCK}"
+
+mount -t cifs -o ro,vers=3.0,username=uBackup,password=Azerty1+ //s-win/commun "${SWIN}"
 if [ $? != 0 ] ; then
 	echo "$0 : erreur montage ${SWIN}"
-	exit 1
+	rm "${LOCK}"
+	trap cleanup 1 2 3 6
 fi
 rsync -av "${SWIN}/" "${BDIR}/s-win/commun"
 umount "${SWIN}"
 
 
-mount -t cifs -o ro,vers=3.0,username=u-backup,password=Azerty1+ //s-win/public "${SWIN}"
+mount -t cifs -o ro,vers=3.0,username=uBackup,password=Azerty1+ //s-win/public "${SWIN}"
 if [ $? != 0 ] ; then
-	echo "$0 : erreur montage"
-	exit 2
+	echo "$0 : erreur montage ${SWIN}"
+	trap cleanup 1 2 3 6
 fi
 rsync -av "${SWIN}/" "${BDIR}/s-win/public"
 umount "${SWIN}"
 
+#libere le verrou
+rm "${LOCK}"
+
 exit 0