Hardware requirements really depend on what you want to do with the server. I have a few raspberry pi, an old PC, and at least one or two old laptops to host things on. But really, I use the old PC the most. It pulls more power than a raspberry pi, but I've found it to be much more reliable and stable.
Drop some additional hard drives if you need a media server. More memory & CPU if you are doing things like manipulating images or transcoding video. I run a webserver and host various subdomains for things I don't want to pay to host. Plus working samples of my portfolio projects. I keep my actual portfolio on cloudflare, but link out to these work samples.
I also host some other apps that are just for my home network. Everything works great on a 10 year old PC sitting in a network closet. You are very likely not in need of professional server hardware.
Quietly arm up. Get in shape. Practice shooting. Learn how to clean & maintain a firearm. Get a stash of food & water going. Get ready. This isn't going to stop, it's only going to get worse.