allow minus in hostname

storage_helper.sh

@@ -241,7 +241,7 @@
 
     # helper function: set internal var for hostname of backup client
     function setBackupclient(){
-        sBackupClient=`echo $1 | sed s"#[^a-zA-Z\.0-9]#_#g"`
+        sBackupClient=`echo $1 | sed s"#[^a-zA-Z\.0-9\-]#_#g"`
         if [ -z $sBackupClient ]; then
             echo ERROR: no backup client was given
             exit 1