VPS.

A VPS is a Virtual Private Server: a remote, always-on computer you rent and leave running in a data centre somewhere. Remy rents one for around $5 a month. The point is that it never sleeps.

If you want an agent working around the clock, you can't tie it to a laptop that shuts when you close the lid. You park it on a VPS instead, so it runs 24/7 the way a Mac Mini or even a Raspberry Pi could.

It gets interesting when you put an autonomous agent on there. To reach that agent on a remote machine, you usually have to expose it on a public URL, and anything publicly reachable can also be reached by people you didn't invite. That's where the security risk comes in. Cheap and powerful, but worth locking down before you leave it running.