updated arg to -c for backup con

Was using -f when it should have been using -c

Author: Djlavoy

example.backup

@@ -9,4 +9,4 @@ BACKUP_USER=root
 BACKUP_NS=backup-name
 BACKUP_KEEP=90
 
-$BACKUP_CMD --server $BACKUP_SERVER -f $BACKUP_CONF -t $BACKUP_DIR -u $BACKUP_USER -n $BACKUP_NS -k $BACKUP_KEEP 
+$BACKUP_CMD --server $BACKUP_SERVER -c $BACKUP_CONF -t $BACKUP_DIR -u $BACKUP_USER -n $BACKUP_NS -k $BACKUP_KEEP