fix typo
diff --git a/start-cassandra.sh b/start-cassandra.sh
index 5fd644e..d4d722c 100755
--- a/start-cassandra.sh
+++ b/start-cassandra.sh
@@ -32,7 +32,7 @@
   echo "Starting cassandra"
   echo "[WARNING] This script copies conf/cassandra.yam to $CASSANDRA_DIR/conf/cassandra.yaml (overwrites)"
   echo "original cassandra.yaml was backed up as cassandra.yaml.backup"
-  cp $CASSANDRA_DIR/conf $CASSANDRA_DIR/conf.backup
+  cp $CASSANDRA_DIR/conf/cassandra.yaml $CASSANDRA_DIR/conf/cassandra.yaml.backup
   cp ${ONOS_HOME}/conf/cassandra.yaml $CASSANDRA_DIR/conf
   $CASSANDRA_DIR/bin/cassandra > $CASSANDRA_LOG 2>&1 
 }
diff --git a/start-zk.sh b/start-zk.sh
index a3be04a..206370f 100755
--- a/start-zk.sh
+++ b/start-zk.sh
@@ -10,7 +10,9 @@
   echo "Starting Zookeeper"
   echo "[WARNING] This script copies conf/zoo.cfg to $ZK_DIR/conf/zoo.cfg (overwrites)"
   echo "original zoo.cfg was backed up as zoo.cfg.backup"
-  cp $ZK_DIR/conf/zoo.cfg $ZK_DIR/conf/zoo.cfg.backup
+  if [ $ZK_DIR/conf/zoo.cfg ]; then
+    cp $ZK_DIR/conf/zoo.cfg $ZK_DIR/conf/zoo.cfg.backup
+  fi
   cp $ZK_CONF $ZK_DIR/conf
   echo "cp $ZK_CONF $ZK_DIR/conf"
   $ZK_DIR/bin/zkServer.sh start