diff --git a/asterix-installer/src/main/resources/schema/installer-conf.xsd b/asterix-installer/src/main/resources/schema/installer-conf.xsd
index 489b024..318e7ce 100644
--- a/asterix-installer/src/main/resources/schema/installer-conf.xsd
+++ b/asterix-installer/src/main/resources/schema/installer-conf.xsd
@@ -18,7 +18,6 @@
     <xs:sequence>
       <xs:element ref="mg:version"/>
       <xs:element ref="mg:url"/>
-      <xs:element ref="mg:backupDir"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>
@@ -26,7 +25,8 @@
 <xs:element name="backup">
   <xs:complexType>
     <xs:sequence>
-      <xs:element ref="mg:hdfs"/>
+      <xs:element ref="mg:hdfs" minOccurs="0"/> 
+      <xs:element ref="mg:backupDir"/>
     </xs:sequence>
   </xs:complexType>
 </xs:element>
diff --git a/asterix-installer/src/main/resources/schema/jaxb-bindings.xjb b/asterix-installer/src/main/resources/schema/jaxb-bindings.xjb
new file mode 100644
index 0000000..b5982e0
--- /dev/null
+++ b/asterix-installer/src/main/resources/schema/jaxb-bindings.xjb
@@ -0,0 +1,9 @@
+<jxb:bindings version="1.0"
+xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
+xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+<jxb:globalBindings>
+  <jxb:serializable uid="1"/>
+</jxb:globalBindings>
+
+</jxb:bindings>
diff --git a/asterix-installer/src/main/resources/scripts/managix b/asterix-installer/src/main/resources/scripts/managix
index cd0794e..11810ef 100755
--- a/asterix-installer/src/main/resources/scripts/managix
+++ b/asterix-installer/src/main/resources/scripts/managix
@@ -1,20 +1,20 @@
-if [ -z $MANAGIX_HOME ] 
+if [ -z $INSTALLER_HOME ] 
  then
-   echo "MANAGIX_HOME is not defined"
+   echo "INSTALLER_HOME is not defined"
    exit 1
 fi
 
 VERSION=0.0.4-SNAPSHOT
 
-for jar in `ls $MANAGIX_HOME/lib/*.jar`
+for jar in `ls $INSTALLER_HOME/lib/*.jar`
   do 
-  if [ -z $MANAGIX_CLASSPATH ] 
+  if [ -z $INSTALLER_CLASSPATH ] 
   then 
-    MANAGIX_CLASSPATH=$jar 
+    INSTALLER_CLASSPATH=$jar 
   else
-    MANAGIX_CLASSPATH=$MANAGIX_CLASSPATH:$jar 
+    INSTALLER_CLASSPATH=$INSTALLER_CLASSPATH:$jar 
   fi
 done
 
-MANAGIX_CLASSPATH=$MANAGIX_CLASSPATH:$MANAGIX_HOME/conf/log4j.properties
-java $JAVA_OPTS -Dlog4j.configuration=file:$MANAGIX_HOME/conf/log4j.properties -cp $MANAGIX_CLASSPATH edu.uci.ics.asterix.installer.driver.InstallerDriver $@
+INSTALLER_CLASSPATH=$INSTALLER_CLASSPATH:$INSTALLER_HOME/conf/log4j.properties
+java $JAVA_OPTS -Dlog4j.configuration=file:$INSTALLER_HOME/conf/log4j.properties -cp $INSTALLER_CLASSPATH edu.uci.ics.asterix.installer.driver.InstallerDriver $@