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You explored the subject of disaster recovery, which is the process of planning and implementing policies to enable your business to continue after experiencing some critical event. A key component of disaster recovery planning involves implementing a backup policy, including regular backups and off-site storage of backup media (which protects your backups from disasters affecting the immediate area of your network operations center). You might also consider encrypting backups, since that way, someone who can access your backup media still wouldnt be able to access the data on it. You learned about different backup techniques, which include:
Two popular strategies for organizing which tapes are used for which days backups are the Towers of Hanoi and the Grandfather-Father-Son methods.
When planning the disaster recovery process, it can be useful to arrange for alternate facilities to be used in the event that the disaster affects your network operations center. A copy of all information needed for business continuation, or access to copies of this information, such as vital employee records and backups, should be available at the alternate site. Types of alternate sites include:
When using alternate sites, you would typically deploy the most business critical functionality first, and work toward getting other functionality up and running on an as-needed, prioritized basis. Similarly, when you can return to your main facility, you should focus on moving functionality back to your main site based on the cost of continuing operations at the alternate site, moving the applications most costly to maintain at the alternate site first.
You learned about disaster recovery plans, which specify who is responsible for each activity, what is needed to accomplish each activity, the order in which disaster recovery steps are performed, where additional resources (such as duplicate systems) can be obtained and how quickly this can happen, as well as estimated costs and financial justification for the plan.
You discovered that when planning for business continuity (allowing critical business functions to continue without interruption or major change), you need to consider several areas:
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