Yes, I have a Pi4 2GB, it’s still working as a second pi hole node. That’s what got me into the world of self-hosting, but 2GB is not enough for a lot of things. I went from that to a N100 with 16GB of RAM, so the difference is huge and I think it’s totally worth the money.

I haven’t tried Immich, but I probably will once I have a better solution for storage.

I just have the included 500GB SSD and an external 2TB HDD, but I’m planning on getting a 4TB 2.5" SSD to put it inside the mini PC, since it has an extra slot for that.

I recently got the Beelink Mini S12 Pro. I’m completely impressed with its capabilities, especially for that price. I got the 16GB Ram N100 version. Great piece of hardware.

I’m running 27 different services, including the *Arrs, Jellyfin, paperless-ngx, home assistant, and even stuff like Kasm workspaces and emulatorjs.

I think you can get the full Orange Pi kit (Pi + sd + power adapter + case) for around 60 bucks on Amazon. There’s also the option of going with a mini PC, you could find them from around 120 bucks.

I know you’re not asking for hardware recommendations, but using an old PC may increase your electric bill way more than any of these options, so that’s something to bear in mind.