Well, I’ve read about people using Mac Minis as home servers, so I’m assuming that one is more powerful than the HP laptop. You’ll probably want to make it the media server.

The HP laptop doesn’t need to be all powerful in order to function as a NAS, so that’s a good job for something with such weak specs. I would remove the battery though. If you keep it plugged in all the time you won’t need it, and batteries that stay charged all the time will end up being ruined anyway. Better to just recycle that than to risk ending up with a spicy pillow.