fix backup
diff --git a/recovery.c b/recovery.c
index 1df7739..440167b 100644
--- a/recovery.c
+++ b/recovery.c
@@ -446,7 +446,7 @@
                 show_install_update_menu();
                 break;
             case ITEM_BACKUP:
-                do_nandroid_backup();
+                do_nandroid_backup(NULL);
                 break;
             case ITEM_RESTORE:
                 show_nandroid_restore_menu();