Disaster Recover Planning also referred to as Business Process Continuity Plan (BPCP) or Business Continuity Plan (BCP) refers to the detailed process that describes how to deal with a disaster and how this process will equally manage to allow them to stay afloat.
Toigo, J. William. Jan 4th 1996 / ISBN -10 Disaster Recovery Planning published by John Wiley and Sons Incorporated states earlier, in case of a fire, the mainframe and other computers had to be switched off before the sprinkles could start working unlike now where the sprinkles immediately start sprinkling as soon as they detect smoke leading to data loss.
DRP can be purchased as software or can be done internally by a DRP department. Many companies despite having DRP in play, have never had a trial run on it and in occurrence of a disaster, it can be prone to failure. The fact is DRP is a smart move to in any organization.