Hot Site

A fully operational offsite data processing facility equipped with hardware and software, to be used in the event of an information system disruption.
SOURCE: SP 800-34

Backup site that includes phone systems with the phone lines already connected. Networks will also be in place, with any necessary routers and switches plugged in and turned on. Desks will have desktop PCs installed and waiting, and server areas will be replete with the necessary hardware to support business-critical functions. Within a few hours, a hot site can become a fully functioning element of an organization.
SOURCE: CNSSI-4009