Disaster recovery

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The English term disaster recovery (in German also called disaster recovery or emergency recovery ) describes measures that are initiated after a failure of components in information technology . This includes both data recovery and the replacement of infrastructure , hardware and organization that are no longer usable . More comprehensive than disaster recovery is the term business continuity , which does not focus on restoring IT services, but rather on uninterrupted business processes.

When assessing a disaster recovery solution, the following points of a business impact analysis must be considered:

  1. Recovery Time Objective ( RTO ) - How long can a business process / system fail? The recovery time objective is the time that can elapse from the point in time of the damage to the complete recovery of the business processes (recovery of: infrastructure - data - reworking of data - resumption of activities). The period can range from 0 minutes (systems must be available immediately) to several days (in individual cases weeks).
  2. Recovery Point Objective ( RPO ) - How Much Data Loss Can Be Accepted ? The recovery point objective is the period of time that can lie between two data backups , i.e. the maximum number of data / transactions that can be lost between the last backup and the system failure. If no data loss is acceptable, the RPO is 0 seconds.

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