Managed Backups returns 405

Managed backups not running, return 405 error:
405 Not Allowed
nginx/1.12.2

After adding Snaphspt define lines the manabed worked but created a small file of 400kb:
if (!defined('SNAPSHOT_FORCE_ZIP_LIBRARY')) define('SNAPSHOT_FORCE_ZIP_LIBRARY', 'pclzip');
if (!defined('SNAPSHOT_IGNORE_SYMLINKS')) define('SNAPSHOT_IGNORE_SYMLINKS', true);

Error log returned warning:
Unable to perform requested system backup, proceeding with builtin