I'm writing this partly because I think others might be interested, partly because I want to know what others think of my setup, and partly because I'm going to upgrade my hardware and need to review my setup so that I can re-create it on the newer hardware.
I have an old 2009 iMac at home that wasn't being used anymore, so I installed Ubuntu server 2022.04 LTS. I have two printers, so I installed the CUPS manager, which allows my to print wirelessly from iPad, iPhones and my MacBook Air. For media, I run PlexMediaServer (video) and Navidrome. For content, I run Transmission, which I can manage from a web browser. For e-books, I use calibre which I access via a web browser (on my iPhone or a Kobo). For coding, I've installed Nginx, MariaDB and PHP.
My router has a built-in VPN, but I'd like to install WireGuard on the server. I'd also like to be able to collect and manage my family's photos. For now, I use MacOS Photos, but since we rarely plug our phones into the computer to sync them, they are usually only backed up to iCloud.
If you listen to audiobooks in addition to your e-books, there is audiobookshelf. You could also consider a recipe manager, like Tandoor or Mealie, or Home Assistant if home automation seems fun.
Yeah, that goes for any data though. The question was more if Immich is really so unstable that it might just shred your images because it had a bad day. And to that I can say: no, it won't. Yet, photos are very important to many people, so they put that warning there.