Physical security involves the protection of 3 main categories of assets: people, equipment, and data.
Implementation of sets of policies and procedures is referred to as Business Continuity Planning (BCP) and Disaster Recovery Planning (DRP).
BCP refers to the plans you put in place to ensure that critical business functions can continue in a state of emergency. DRP refers to the plans you put in place to prepare for potential disaster, including what exactly to do during and after a disaster strikes.
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3 main types of physical controls: Deterrent, Detective, and preventive
Use of Redundant arrays of inexpensive disks (RAID) in a variety of configurations for your backups. RAID is a method of copying data to more than one storage device to protect the data if any one device is destroyed.