Hi again,
I research a little bit because I am beginner in wordpress. I found out that the WP Cron is really only triggered an page view. This means it is a pseudo-cron because intervals will only be check when a user visit the site.
I guess what @kubitomakita suggest is to have a external cron job (outsite of wordpress) which pulls a page or executes wp-cron.php.
Hope this was a reasonably good answer to my own question ??
Cheers