Admin Backup Cron Jobs not running?

In the Admin Backup/Transfer section, I've created a Backup Cron job to run daily at 3am, however the cron job is not running.

In this same section under Create Backup, if I choose the "Now" option it will run the backup job successfully.

But the cron job is not running at night. And if I select the specific cron job and click Run Now, the cron job still does not run.

How can I determine what is going on?

Screenshot here:

Screen Shot 2017-07-27 at 11.30.24 PM.png

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