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<?php
define('SITEURL', 'WEBSITE_ABSOLUTE_URL'); // Base URL of your site
define('SECRETKEY', 'SECRET_WORD_HERE'); // Your secret key
define('PROFILE',1); // The profile's ID


// ====================== DO NOT MODIFY BELOW THIS LINE ======================
$curl_handle=curl_init();
curl_setopt($curl_handle,CURLOPT_URL,
SITEURL.'/index.php?option=com_akeeba&view=backup&key='.
SECRETKEY.'&profile='.PROFILE);
curl_setopt($curl_handle,CURLOPT_FOLLOWLOCATION,TRUE);
curl_setopt($curl_handle,CURLOPT_MAXREDIRS,10000); # Fix by Nicholas
curl_setopt($curl_handle,CURLOPT_RETURNTRANSFER,1);
$buffer = curl_exec($curl_handle);
curl_close($curl_handle);
if (empty($buffer))
    echo "Sorry, the backup didn't work.";
else
    echo $buffer;
?>

//every day at 4:00 A.M.

30	4	*	*	* php -q /home/SITE_NAME/public_html/backup.php