Immich is extremely stable even if not labeled as such. My personal experience is zero maintenance (other than updating docker container) since deployment several years ago.

Stability also implies that we don’t have to update our server version every couple of days/weeks because otherwise the mobile app stops working. I’m ok upgrading but it gets old wondering why the photos aren’t showing up and then realizing that it’s because the versions are out of sync and the mobile app just refuses to talk to the server.

Yeah, short compatibility ranges between the app and sever is one of my biggest pain points right now.

I went through one upgrade a year or so ago that forced me to redo my backup so I'm a little shy of going all in again until they say stable.

This sounds a bit like my experience with Home Assistant, it's very stable as long as I don't frequently update it. If I install every update I've frequently messed up my installation/config.

> If I install every update I've frequently messed up my installation/config.

I've had it running for a year and have fearlessly and immediately updated. Never messed anything up, somewhat remarkably.