This option is only available in Akeeba Backup Professional.
Unlike Akeeba Backup 3.x to 8.x inclusive, the CRON script is no longer a standalone PHP application. Instead, it's implemented as a command for Joomla CLI application.
First of all, you need to make sure that the Console – Akeeba Backup plugin is published and its Access is set to Public. If you do not do that, Joomla does not know about Akeeba Backup's CLI commands.
Further to that, keep in mind that the Joomla CLI Application DOES NOT run at all under the PHP-CGI binary. It will only run under the PHP-CLI binary. Our custom CLI scripts in versions 3.x to 8.x did run under PHP-CGI, with some caveats which could cause the backups to fail with a timeout error. Therefore the Joomla CLI application may fail to run in some cases our scripts used to work. THIS IS NOT A BUG IN OUR SOFTWARE AND WE HAVE ABSOLUTELY ZERO CONTROL OVER IT. Please file a bug report with the Joomla project so they can fix it.
In order to schedule a backup failure check, you will have to use the following command line to your host's CRON interface:
/usr/local/bin/php is the
path to your PHP CLI executable and
/home/USER/webroot is the absolute path
to your web site's root. You can get this information from your
The same considerations and scheduling information as the backup CRON script apply.