If you're thinking of running OpenClaw on your main PC, I'd strongly suggest using a VPS instead. Anything you can do on your PC, OpenClaw will be able to do on your PC, which is extremely risky if you have personal info on it.
A VPS is essentially just a fresh virtual PC. That way you're not risking any of your personal data and the VPS runs 24/7 so you'll have access to the bot whenever you want. It's also much cheaper than spending hundreds of dollars on a dedicated device like a Mac Mini.