A warm site has some basic equipment or in some case almost all of the equipment but it is not sufficient to be operational without bringing in the last backup and in some cases more computers and other equipment.
The following answers are incorrect:
hot site. Is incorrect because a hot-site is fully configured with all the required hardware. The only thing missing is the last backup and you are up and running.
Rolling hot site. Is incorrect because a rolling hot-site is fully configured with all the required hardware.
cold site. Is incorrect because a cold site has basically power, HVAC, basic cabling, but no or little as far as processing equipment is concerned. All other equipment must be brought to this site. It might take a week or two to reconstruct.
References:
OIG CBK Business Continuity and Disaster Recovery Planning (pages 368 - 369)
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