Turning the power on and off again is really probably worse for it then leaving on tbh. And make sure you take the battery out.

Yes, horny milfs are now homing in on your position and will be there any minute, start barricading.

Servers use literally the exact same hardware that’s in your desktop. All that matters is what your doing with it?

Does it serve requests to the network in some way? Then it’s a server. You can install e.g. apache on your desktop and if you turn it on, it is now a server.