This script will check for last successful Time Machine backup, and it checks to ensure a backup hass happened in the last 7 days.
If there has been a backup within 7 days, it will output a successful echo to Datto RMM. If there has not been a backup, it will exit with a 1 and submit an alert to your dashboard. It can also be configured to automatically sent a ticket.
NOTE: I Have not tested this with any other RMM, but the code should work with a little adjustment to where you send your values.