fix bugs in config.example and install.sh

config.example

@@ -4,4 +4,4 @@ PBS_PASSWORD='XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX'
 PBS_DATASTORE='backup'
 PBS_NAMESPACE='MyBackups'
 
-BACKUP=['root.pxar:/', 'data.pxar:/mnt/data']
+BACKUP=('root.pxar:/' 'data.pxar:/mnt/data')

install.sh

@@ -42,7 +42,7 @@ chmod o= "$TMPDIR/config.example"
 
 "$TMPDIR/pbc" install
 rc=$?
-if (( $? != 0 )); then
+if (( $rc != 0 )); then
   echo "Error installing pbc requirements!" >&2
   exit $rc
 fi