automate - how does it work

Hi,
how Automate in your HUB work?
Every 3 hours (by default) it looks for updates. And if updates of 2 or more plugins exists, will it run backup and than update all plugins and than run safe upgrade check, or will it run backup and update one plugin and run safe upgrade check and than backup and update second plugin and run safe upgrade check etc.?
Thanks,
Jiri