If a vCenter Server instance fails, you can restore it from its file-based backup.
Prerequisites
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Power off and rename the failed vCenter Server instance.
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Verify that you have a valid file-based backup of the failed vCenter Server instance.
To be valid, the backup must be of the version of the vCenter Server Appliance on which you plan to restore the instance.
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Verify that you have the SFTP server details:
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SFTP Server IP
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SFTP Server Username
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SFTP Server Password
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Encryption Password