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The CISA® Prep Guide: Mastering the Certified Information Systems Auditor Exam by John Kramer

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5.4. Evaluating Media and Documentation Back Up Procedures

Processes that create back up copies of the computer programs and data will be an obvious part of the contingency planning that will need to be evaluated in order to form an opinion on the sufficiency of the DRP. The processes you observe should be in place in such a way as to make these back ups easily available for recovery when needed with a minimal amount of extra steps necessary to make them available and useful to the recovery process. There are two main uses for back up copies of programs and data: One is the recovery from loss, disruption, or disaster, which is either partial or extensive; and the second is for archival and historical record-keeping purposes, such as an audit trail perhaps. The change control procedures must be closely coordinated with the back up process and the DRP so that the available recovery data and program code will most closely represent the processing that was occurring at the time of disruption. Some thought must be given to the recovery limitations—how the gap between what occurred since the last back ups occurred and the time of disruption, and what process will be used to return to where the process was left at the time of disruption—enabling the process to move forward from that point.

Schedules for moving back up data off-site will need to be planned so that the copies do not remain in the same general area as the current production version of the data for long time periods. Until ...

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