Use two cronjobs at the same time?


is it possible to use the ajax "cron" and a webcron at the same time? I can select the type of the cronjob in the Menu settings -> cron

What will happen if I select ajax cron in settings, but also call the cron.php file? I'd like to use the cron method. But my owncloud-installation is on a webspace and not a server. So I have to use an external webcron service. I'd like to use a free one. But in this case I can`t be sure that the webcron is reliable. To enhance the reliability I'd like to use both: ajax cron and webcron.

Is this possible? Thanks.