I host it as a docker container and the maintenance has been painless

I self-host https://woodpecker-ci.org/ and I love it. It was easy to set up, and I never have to worry about CI/CD minutes.

It’s been continued in another repo https://github.com/sysadminsmedia/homebox

Homebox is great, I bought a usb label maker specifically for it

I’m not familiar with btrbk specifically, but my backups all send a ping to https://healthchecks.io/ when they start and when they finish. healthchecks.io works by getting a simple curl request, similar to ntfy, but if that request doesn’t happen after a certain amount of time (or if you do a start request and a succeed/fail request and the job is taking too long) then it will notify you. It can use ntfy for notifications, but it can also send emails or use any of a number other services.

Seconding radicale, I’ve been using it for over a year and it’s been rock solid. I can’t say the same about NextCloud, it seemed to break every update and was slow as hell. I moved to SyncThing and never looked back.