The Backup Critical Console Data function saves the HMC data stored on your HMC hard drive to the DVD-RAM and is critical to support HMC operations. Back up the HMC after you have made changes to the HMC or to the information associated with partitions. In the case of a non-recoverable hard disk failure, the HMC will need to be re-installed from the HMC Recovery CD. As part of this re-installation, you will be prompted to insert the backup media. This will restore the HMC to the state that existed at the time of the last backup.
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