Oh but I have them !
Every day an email is sent out with the backup status.
Every day I got my email in the morning with the back up logs.
For years.
I associated email received to backup successful, until a month or so when my vpn broke and the emails where just “could not connect”, but it took me a while to bother actually opening the message body as it had always been the same for years.

So I’ll manage it differently, have the email subject be more explicit about a success or a failure amongst other things.
Always learning :^)

Then it turns out your monitoring system failed and FUCK IT’S BEEN A MONTH SINCE THE LAST PROPER BACKUP