diff --git a/scripts/backup.sh b/scripts/backup.sh
index 4cb8611..6766ff1 100755
--- a/scripts/backup.sh
+++ b/scripts/backup.sh
@@ -1,54 +1,63 @@
 #!/bin/bash
-# scripts/backup.sh - Backup complet Nextcloud
+# ============================================
+# Script de sauvegarde Nextcloud
+# ============================================
+# Ce script crée une sauvegarde complète de:
+# - Données utilisateur
+# - Données utilisateur
 
 set -euo pipefail
 
-# Variables globales
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+if [ -f .env ]; then
+  set -a
+  source .env
+  set +a
+else
+  echo -e "${RED}Erreur: Fichier .env non trouvé${NC}"
+  exit 1
+fi
+
+# Variables
+DATE=$(date +%Y%m%d_%H%M%S)
+MAINTENANCE_ENABLED=false
+
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
 PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
 cd "$PROJECT_ROOT"
 
 LOCK_FILE="/tmp/nextcloud_backup.lock"
-LOG_DIR="./logs"
+
+LOG_DIR="${LOG_DESTINATION:-./logs}"
 LOG_FILE="$LOG_DIR/backup_$(date +%Y%m%d_%H%M%S).log"
-MAINTENANCE_ENABLED=false
-
-# Créer le dossier de logs
-mkdir -p "$LOG_DIR"
-
-# Fonction de logging
-log() {
-  local level="$1"
-  shift
-  local message="$*"
-  local timestamp
-  timestamp=$(date '+%Y-%m-%d %H:%M:%S')
-  echo "[$timestamp] [$level] $message" | tee -a "$LOG_FILE"
-}
-
-# Charger les variables d'environnement
-if [ ! -f .env ]; then
-  log "ERROR" "Fichier .env introuvable"
-  exit 1
-fi
-
-# Charger .env de manière sécurisée
-set -a
-# shellcheck disable=SC1091
-source .env
-set +a
-
-# Vérifier les variables requises
-: "${MYSQL_USER:?Variable MYSQL_USER non définie}"
-: "${MYSQL_PASSWORD:?Variable MYSQL_PASSWORD non définie}"
-: "${MYSQL_DATABASE:?Variable MYSQL_DATABASE non définie}"
 
 BACKUP_DIR="${BACKUP_DESTINATION:-./backups}"
 BACKUP_RETENTION_DAYS="${BACKUP_RETENTION_DAYS:-7}"
-DATE=$(date +%Y%m%d_%H%M%S)
 BACKUP_NAME="nextcloud_backup_$DATE"
 BACKUP_PATH="$BACKUP_DIR/$BACKUP_NAME"
 
+source "$SCRIPT_DIR/common.sh"
+
+if [ -z "${MYSQL_DATABASE:-}" ] || [ -z "${MYSQL_USER:-}" ] || [ -z "${MYSQL_PASSWORD:-}" ]; then
+  log "ERROR" "Variables MysqlSQL non définies dans .env"
+  exit 1
+fi
+
+# Vérifier qu'un backup n'est pas déjà en cours
+if [ -f "$LOCK_FILE" ]; then
+  log "ERROR" "Une sauvegarde est déjà en cours. Si aucune sauvegarde n'est en cours, supprimez le fichier: $LOCK_FILE"
+  exit 1
+fi
+
+touch "$LOCK_FILE"
+
+mkdir -p "$LOG_DIR"
+
 # Fonction de nettoyage en cas d'erreur
 cleanup() {
   local exit_code=$?
@@ -83,15 +92,6 @@ cleanup() {
 
 trap cleanup EXIT INT TERM
 
-# Vérifier qu'un backup n'est pas déjà en cours
-if [ -f "$LOCK_FILE" ]; then
-  log "ERROR" "Un backup est déjà en cours (lock file: $LOCK_FILE)"
-  exit 1
-fi
-
-# Créer le lock file
-echo $$ > "$LOCK_FILE"
-
 log "INFO" "=== Démarrage du backup: $BACKUP_NAME ==="
 log "INFO" "Log file: $LOG_FILE"
 
@@ -135,18 +135,18 @@ if ! docker-compose exec -T db sh -c "MYSQL_PWD=\"\$MYSQL_PASSWORD\" mysqldump \
 fi
 END_TIME=$(date +%s)
 DB_SIZE=$(du -h "$BACKUP_PATH/database.sql" | cut -f1)
-log "INFO" "Base de données sauvegardée: $DB_SIZE ($(( END_TIME - START_TIME ))s)"
+log "INFO" "Base de données sauvegardée: $DB_SIZE ($((END_TIME - START_TIME))s)"
 
 # 3. Backup des fichiers de config
 log "INFO" "Backup de la configuration..."
 START_TIME=$(date +%s)
-if ! docker-compose exec -T -u www-data nextcloud tar -czf - -C /var/www/html/config . > "$BACKUP_PATH/config.tar.gz" 2>>"$LOG_FILE"; then
+if ! docker-compose exec -T -u www-data nextcloud tar -czf - -C /var/www/html/config . >"$BACKUP_PATH/config.tar.gz" 2>>"$LOG_FILE"; then
   log "ERROR" "Erreur lors du backup de la configuration"
   exit 1
 fi
 END_TIME=$(date +%s)
 CONFIG_SIZE=$(du -h "$BACKUP_PATH/config.tar.gz" | cut -f1)
-log "INFO" "Configuration sauvegardée: $CONFIG_SIZE ($(( END_TIME - START_TIME ))s)"
+log "INFO" "Configuration sauvegardée: $CONFIG_SIZE ($((END_TIME - START_TIME))s)"
 
 # 4. Backup des données utilisateurs
 log "INFO" "Backup des données utilisateurs..."
@@ -156,19 +156,19 @@ if ! docker-compose exec -T -u www-data nextcloud tar -czf - \
   --exclude='appdata_*/preview' \
   --exclude='*/cache' \
   --exclude='*/thumbnails' \
-  . > "$BACKUP_PATH/data.tar.gz" 2>>"$LOG_FILE"; then
+  . >"$BACKUP_PATH/data.tar.gz" 2>>"$LOG_FILE"; then
   log "ERROR" "Erreur lors du backup des données"
   exit 1
 fi
 END_TIME=$(date +%s)
 DATA_SIZE=$(du -h "$BACKUP_PATH/data.tar.gz" | cut -f1)
-log "INFO" "Données sauvegardées: $DATA_SIZE ($(( END_TIME - START_TIME ))s)"
+log "INFO" "Données sauvegardées: $DATA_SIZE ($((END_TIME - START_TIME))s)"
 
 # 5. Backup des apps personnalisées
 log "INFO" "Backup des apps personnalisées..."
 if docker-compose exec -T nextcloud [ -d /var/www/html/custom_apps ] 2>>"$LOG_FILE"; then
   if docker-compose exec -T -u www-data nextcloud tar -czf - \
-    -C /var/www/html/custom_apps . > "$BACKUP_PATH/apps.tar.gz" 2>>"$LOG_FILE"; then
+    -C /var/www/html/custom_apps . >"$BACKUP_PATH/apps.tar.gz" 2>>"$LOG_FILE"; then
     APPS_SIZE=$(du -h "$BACKUP_PATH/apps.tar.gz" | cut -f1)
     log "INFO" "Apps sauvegardées: $APPS_SIZE"
   else
@@ -196,11 +196,11 @@ if ! tar -czf "$BACKUP_DIR/$BACKUP_NAME.tar.gz" -C "$BACKUP_DIR" "$BACKUP_NAME/"
 fi
 END_TIME=$(date +%s)
 ARCHIVE_SIZE=$(du -h "$BACKUP_DIR/$BACKUP_NAME.tar.gz" | cut -f1)
-log "INFO" "Archive créée: $ARCHIVE_SIZE ($(( END_TIME - START_TIME ))s)"
+log "INFO" "Archive créée: $ARCHIVE_SIZE ($((END_TIME - START_TIME))s)"
 
 # 8. Générer le checksum SHA256
 log "INFO" "Génération du checksum SHA256..."
-if cd "$BACKUP_DIR" && sha256sum "$BACKUP_NAME.tar.gz" > "$BACKUP_NAME.tar.gz.sha256"; then
+if cd "$BACKUP_DIR" && sha256sum "$BACKUP_NAME.tar.gz" >"$BACKUP_NAME.tar.gz.sha256"; then
   cd "$PROJECT_ROOT"
   CHECKSUM=$(cut -d' ' -f1 "$BACKUP_DIR/$BACKUP_NAME.tar.gz.sha256")
   log "INFO" "Checksum: $CHECKSUM"
diff --git a/scripts/common.sh b/scripts/common.sh
new file mode 100644
index 0000000..7d4c566
--- /dev/null
+++ b/scripts/common.sh
@@ -0,0 +1,33 @@
+# scripts/common.sh - Fonctions communes à tous les scripts
+
+# Couleurs
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m'
+
+# Fonction de logging
+log() {
+  local level="$1"
+  shift
+  local message="$*"
+  local timestamp
+  timestamp=$(date '+%Y-%m-%d %H:%M:%S')
+
+  local color=""
+  case "$level" in
+  ERROR) color="${RED}" ;;
+  WARN) color="${YELLOW}" ;;
+  SUCCESS) color="${GREEN}" ;;
+  INFO) color="" ;;
+  esac
+
+  echo "[$timestamp] [$level] $message" >>"${LOG_FILE:-/tmp/script.log}"
+
+  if [ -t 1 ]; then
+    echo -e "${color}[$timestamp] [$level] $message${NC}"
+  else
+    echo "[$timestamp] [$level] $message"
+  fi
+}