Do tasks assignees get reminder mails about tasks that are still open? And can we set those up?

Yes, a reminder email is sent out when the task is created and before the deadline of the task. 

They will get notifications:

1. When the task is assigned (i.e. when a onboardee is created, or a new task is created in the library).

2. 7 days before due date 

3. 1 day before due date.

At the moment, you cannot customize the reminders yourself. 

Contact your CSM or Support and we will update the reminders for you.

We're always happy to help ! :)