Hot sites are generally exact mirrors of the main site but in a geographically isolated location. Thus, if an earthquake takes out the main computer, the hot site in another state or the other side of the world can kick in and take over.

The concept of a hot site is not new. Is it a reasonable question to ask why there is no deployable hot site - perhaps even at mission control - for a massively expensive project like the International Space Station?{moscomment}