I am a big fan of "mini desktop" computers for this sort of task (my lemmy instance is running on one). You can usually pick them up used/refurbished for pretty cheap with decent specs: i5 or better processors, upgradeable RAM (SO-DIMM), M.2 or 2.5in SSD. They are quite small, and relatively low power. I have a few in my homelab, and one acting as my media-center PC in my living room.
2gb will be limiting, and the database will kill SD cards quickly (like, a couple weeks kind of quickly) However if it's just you and <100 other people it will not be stressed otherwise
You should mount an external disk for your data. That should help keep your instance alive.
Yeah, don't use SD for something, that continuously writes data on it. One power outage and it will die.
Source: lost 2 sds on my OPi 3 lts.
For little computers like the Pi and its clones, I'd recommend using a SATA SSD via USB rather than an SD card, unless your use case has very few writes. I'd recommend this cable: https://www.amazon.com/gp/product/B00XLAZODE/. It's one of the ones that's well supported by the Pi, and is what I use.
Edit: I recommended a SATA SSD rather than NVMe because you won't really notice a major difference over USB, and some NVMe drives pull more power than the Pi's USB ports can handle (SATA uses quite a bit less power).
Thanks, this is what I am using now for Home Assistant, but overall it's a bit expensive for the power you get with a Pi4.
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