Back in 2012 or so, I reused an old netbook (an Asus Eee PC) with an Atom CPU & 1GB of RAM, installed Ubuntu Server, and used it as a home server. It handled the printer, DNS-VPN proxying for streaming, and a few other things admirably for years. (And ironically was resilient to Spectre because its Atom CPU was before Intel added speculative execution)

Eventually, the thing that kicked the bucket was actually the keyboard (and later the fan started making "my car won't start" noises occasionally). Even the horribly-slow HDD (that handled Ubuntu Server surprisingly well) hadn't died yet.