FWIW, our self-hosted Gitea instance has not had a single second of unplanned downtime in five years we've been running it. And there wasn't much _planned_ downtime because it's really easy to upgrade (pull a new image and recreate the container — takes out the instance for maybe 15 seconds late at night), and full backups are handled live thanks to zfs.

Migration to a new host takes another 15 seconds thanks to both zfs and containers.

I don't know how many GitHub downtime reports I've seen during that time, we're probably into high dozens by now.