"Hack proof" does not exist. If it gets power, or talks on the web, it has a door that someone can figure out how to get through. The simple question is whether or not they will. That's it.
Keep things updated, remove unnecessary accounts/services/features. Use long (30+ char) passwords and don't advertise your hack proof security system.
Edit: This video link didn't take the time command. Go to 12 min, 5 seconds. Only comment you need to hear.