remove wrong argument

backup.py

@@ -31,7 +31,7 @@ def main():
                 print('({})'.format(cmd))
                 os.system(cmd)
                 cmd = 'ssh {} "find {} -mindepth 1 -mtime +{} -delete"'.format(
-                    host, hosts[host][service],backup_dir, backup_server_age)
+                    host, hosts[host][service], backup_server_age)
                 print('({})'.format(cmd))
                 os.system(cmd)