I've not quite been running mine for a day, so far. So, I'm not a great authority. But, so far, all the docker containers together are taking less than 500MB RAM and barely any CPU. And this is on a repurposed old gaming PC in my basement that's also hosting Mastodon, Calckey, and a bunch of other ill-advised crap. I've been using tailscale and a super cheap linux cloud host with some reverse proxies to expose the services to the internet