With the regular email digest you will never miss a request, update, or mention in Back. Every morning you would receive an overview of what happened the previous day that you have not seen yet, so that you can get ahead of the rush:
For each of your teams you'd see:
How many new, unassigned request are there
How many requests assigned to you were updated (and you have not seen those updates yet)
In which requests were you mentioned
In which requests was your approval requested
If there are no updates, you would not receive any e-mail.