Disaster recovery is one of the most important things that you can learn in system administration. Administering a server doesn't mean anything if you can't bring it back to life should something happen to it, such as a catastrophic disk failure or an Active Directory database corruption.
The fine art of disaster recovery not only includes restoring files from a backup device, but also locating potential problems that could lead to a crashed server, restoring services after a reinstallation of the operating system, and a multitude of other duties.
Setting up a response plan
Practicing recovery by using ASR
Recovering the operating system on a failed server
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