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  • The Seven Tiers of Disaster Recovery was originally defined by SHARE to help identify the various methods of recovering mission-critical computer systems as required to support business continuity. IBM also aided in the development of the model. Although the original known published concept dates back to the 1990s, Business Continuity Planning and Disaster Recovery specialists today continue to use the 7 Tiers to illustrate continuity capabilities and costs at a very high level. The definitions for the various Tiers have been updated as technology has evolved in support of today's business requirements and their associated Recovery Time Objective and Recovery Point Objective.