Even though my backups seem to be working fine, the page still displays this error message:
BackUpWordPress has detected a problem. wp-cron.php is returning a name lookup timed out response which could mean cron jobs aren't getting fired properly. BackUpWordPress relies on wp-cron to run scheduled back ups. See the FAQ for more details.
What should I do to fix it? Already tried adding
define( 'ALTERNATE_WP_CRON', true ); to wp-config.php but the message still appears.