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IT disaster recovery
IT disaster recovery (also, simply disaster recovery (DR)) is the process of maintaining or reestablishing vital infrastructure and systems following a natural or human-induced disaster, such as a storm or battle. DR employs policies, tools, and procedures with a focus on IT systems supporting critical business functions. This involves keeping all essential aspects of a business functioning despite significant disruptive events; it can therefore be considered a subset of business continuity (BC). DR assumes that the primary site is not immediately recoverable and restores data and services to a secondary site.
IT service continuity (ITSC) is a subset of BCP, which relies on the metrics (frequently used as key risk indicators) of recovery point/time objectives. It encompasses IT disaster recovery planning and the wider IT resilience planning. It also incorporates IT infrastructure and services related to communications, such as telephony and data communications.
Planning includes arranging for backup sites, whether they are "hot" (operating prior to a disaster), "warm" (ready to begin operating), or "cold" (requires substantial work to begin operating), and standby sites with hardware as needed for continuity.
In 2008, the British Standards Institution launched a specific standard supporting Business Continuity Standard BS 25999, titled BS25777, specifically to align computer continuity with business continuity. This was withdrawn following the publication in March 2011 of ISO/IEC 27301, "Security techniques — Guidelines for information and communication technology readiness for business continuity."
ITIL has defined some of these terms.
The Recovery Time Objective (RTO) is the targeted duration of time and a service level within which a business process must be restored after a disruption in order to avoid a break in business continuity.
According to business continuity planning methodology, the RTO is established during the business impact analysis (BIA) by the owner(s) of the process, including identifying time frames for alternate or manual workarounds.
RTO is a complement of RPO. The limits of acceptable or "tolerable" ITSC performance are measured by RTO and RPO in terms of time lost from normal business process functioning and data lost or not backed up during that period.
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IT disaster recovery
IT disaster recovery (also, simply disaster recovery (DR)) is the process of maintaining or reestablishing vital infrastructure and systems following a natural or human-induced disaster, such as a storm or battle. DR employs policies, tools, and procedures with a focus on IT systems supporting critical business functions. This involves keeping all essential aspects of a business functioning despite significant disruptive events; it can therefore be considered a subset of business continuity (BC). DR assumes that the primary site is not immediately recoverable and restores data and services to a secondary site.
IT service continuity (ITSC) is a subset of BCP, which relies on the metrics (frequently used as key risk indicators) of recovery point/time objectives. It encompasses IT disaster recovery planning and the wider IT resilience planning. It also incorporates IT infrastructure and services related to communications, such as telephony and data communications.
Planning includes arranging for backup sites, whether they are "hot" (operating prior to a disaster), "warm" (ready to begin operating), or "cold" (requires substantial work to begin operating), and standby sites with hardware as needed for continuity.
In 2008, the British Standards Institution launched a specific standard supporting Business Continuity Standard BS 25999, titled BS25777, specifically to align computer continuity with business continuity. This was withdrawn following the publication in March 2011 of ISO/IEC 27301, "Security techniques — Guidelines for information and communication technology readiness for business continuity."
ITIL has defined some of these terms.
The Recovery Time Objective (RTO) is the targeted duration of time and a service level within which a business process must be restored after a disruption in order to avoid a break in business continuity.
According to business continuity planning methodology, the RTO is established during the business impact analysis (BIA) by the owner(s) of the process, including identifying time frames for alternate or manual workarounds.
RTO is a complement of RPO. The limits of acceptable or "tolerable" ITSC performance are measured by RTO and RPO in terms of time lost from normal business process functioning and data lost or not backed up during that period.