diff --git a/backup.sh b/backup.sh
index 7cb7a18..d3afeff 100644
--- a/backup.sh
+++ b/backup.sh
@@ -4,3 +4,9 @@ if [ $UID -ne 0 ] ; then
   echo "need root"
   exit 1
 fi
+
+for dir in "$@" ; do
+  test -d $dir || { echo $dir dont exist ; continue ; } 
+  echo cp -a $dir bkpdir/
+done
+