Computers these days are fast enough for almost everything I want to do, except running big LLMs locally. I'm running a used workstation given to me by a friend a few years ago. I tend to run things into the ground. I'm not hugely worried about security, as I'm retired, and pretty much have nothing worth stealing.
I use Backblaze to keep my data safe, and it's saved my bacon more than once.
I'll be switching to Linux once Windows 10 goes EOL for good. I've got to figure out how to migrate away from WikidPad, or fix it to work with Linux before that date. It's the thing that stopped me a few years ago when I had to migrate back.