diff --git a/backup.sh b/backup.sh
index 656dff4..6e7a083 100644
--- a/backup.sh
+++ b/backup.sh
@@ -8,15 +8,15 @@ then
 fi
 
 
-# Chef if ATTACHMENT_BACKUP_FILE exist. If it's true, attechment are backup. We define var with or without TIMESTAMP
+# Check if ATTACHMENT_BACKUP_FILE exist. If it's true, attechment are backup. We define var with or without TIMESTAMP
 # In anycase, we define var LOCALVAR_ATTACHMENT_BACKUP_FILE to limit the complexity of code (the number of if-else)
-LOCALVAR_ATTACHMENT_BACKUP_FILE = ""
-if [ ! -z "${ATTACHMENT_BACKUP_FILE}" ]
+if [ ! -z $ATTACHMENT_BACKUP_FILE ]
 then
-  LOCALVAR_ATTACHMENT_BACKUP_FILE = ${ATTACHMENT_BACKUP_FILE}
+  LOCALVAR_ATTACHMENT_BACKUP_FILE="$ATTACHMENT_BACKUP_FILE"
+else
+  LOCALVAR_ATTACHMENT_BACKUP_FILE=""
 fi
 
-
 if [ $TIMESTAMP = true ]
 then
   FINAL_BACKUP_FILE="$(echo "$BACKUP_FILE")_$(date "+%F-%H%M%S")"
@@ -36,16 +36,17 @@ else
 fi
 
 
-if [ ! -z "${ATTACHMENT_BACKUP_FILE}" ]
+if [ ! -z $ATTACHMENT_BACKUP_FILE ]
 then
-  /bin/tar -cvzf ${FINAL_BACKUP_ATTACHMENT}.tgz ${ATTACHMENT_DIR}
+  echo "Create tar ${FINAL_BACKUP_ATTACHMENT}.tgz\n"
+  /bin/tar -czf ${FINAL_BACKUP_ATTACHMENT}.tgz ${ATTACHMENT_DIR}
 fi
 
 if [ ! -z $DELETE_AFTER ] && [ $DELETE_AFTER -gt 0 ]
 then
   find $(dirname "$BACKUP_FILE") -name "$(basename "$BACKUP_FILE")*" -type f -mtime +$DELETE_AFTER -exec rm -f {} \; -exec echo "Deleted {} after $DELETE_AFTER days" \;
 
-  if [ ! -z "${ATTACHMENT_BACKUP_FILE}" ]
+  if [ ! -z $ATTACHMENT_BACKUP_FILE ]
   then
     find $(dirname "$FINAL_BACKUP_ATTACHMENT") -name "$(basename "$FINAL_BACKUP_ATTACHMENT")*" -type f -mtime +$DELETE_AFTER -exec rm -f {} \; -exec echo "Deleted {} after $DELETE_AFTER days" \;
   fi