You need at least 16gb of ram to run a caching server like primals. If you got that, plus the storage, you could actually just make your own version of their app that connects to your own caching server instead. It's all open source, I looked into this and barely any code needs to be changed, but it would be too expensive for me. Instead I'm just going to set up an aggregator/bouncer and a personal relay. When I get around to it