Info on monitoring of backups

We use the backup option for backing up some of our sites, but we noticed that some backups stopped running. The issue was server related and was solved, but I'm interested in monitoring the backups and notification when they fail.

We enable backups using the key under docker4drupal:

stage_overwrites:
  main:
    docker4drupal:
      backup:
        enable: true
        crontime: '55 */12 * * *'
        remoterepo: 'root@some.server.at:backup'

It looks like the docker4drupal.backup key is a customisation (I couldn't find it in the wodby/docker4drupal project), so I wanted to ask if there was some information to help with setting up monitoring. A link to any relevant documentation would be useful.

I'd be grateful for any support here 😄 Thanks.