Index: nutchez-0.2/src/shell/nutchez
===================================================================
--- nutchez-0.2/src/shell/nutchez	(revision 243)
+++ nutchez-0.2/src/shell/nutchez	(revision 249)
@@ -64,4 +64,6 @@
         exit
     fi 
+    cp -f "${NutchEZ_HOME}/system/nutch_nodes" "${NutchEZ_HOME}/system/nutch_nodes.bak"
+
 # 若 nutch_nodes 被更新過，則要求更新 /etc/hosts
 elif [ ${NutchEZ_HOME}/system/nutch_nodes -nt ${NutchEZ_HOME}/system/nutch_nodes.bak ]; then