We use the schedule notifications as a way of keeping track of server operational and email status. We have found that when a server stops sending these notification emails it is either an indication that the email functionality is not working or the server is having trouble.
When importing schedules from FileMaker Server 16 into FileMaker Server 17 the email notification settings are preserved. However when viewing or creating new backups or Script Schedules with the FileMaker Server 17 console there does not appear to be a way to add a notification email address. This was not listed on the "removed features". There does not appear to be a way to view or add it via the Command Line Interface.