diff --git a/src/main/java/org/ultramine/server/MultiWorld.java b/src/main/java/org/ultramine/server/MultiWorld.java
index 6ed013e..aad1ec5 100644
--- a/src/main/java/org/ultramine/server/MultiWorld.java
+++ b/src/main/java/org/ultramine/server/MultiWorld.java
@@ -295,7 +295,8 @@
 		else
 			nameToWorldMap.put(name, world);
 		
-		backupDirs.add(name);
+		if(!(world instanceof WorldServerMulti))
+			backupDirs.add(name);
 	}
 	
 	public WorldServer getWorldByID(int dim)