Index: trunk/admin/backup/backup3.php
===================================================================
diff -u -r374 -r2536
--- trunk/admin/backup/backup3.php	(.../backup3.php)	(revision 374)
+++ trunk/admin/backup/backup3.php	(.../backup3.php)	(revision 2536)
@@ -1,5 +1,5 @@
 <?php
-if(!strlen($pathtoroot))
+if( !(isset($pathtoroot) && $pathtoroot) )
 {
   $path=dirname(realpath(__FILE__));
   if(strlen($path))
@@ -42,7 +42,7 @@
 	  $p = "";
       }
     }
-    if(!strlen($pathtoroot))
+    if( !(isset($pathtoroot) && $pathtoroot) )
       $pathtoroot = ".".$pathchar;
   }
   else