A restore operation for Google Cloud Platform includes the following stages:
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Create disks in the project where the VSA proxy is deployed.
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Attach disks to the VSA proxy.
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Write data to the disks from the MediaAgent.
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Detach the disks after writes are complete.
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For environments where the VSA proxy and its associated project are different than the project associated with the backup instance (guest), then:
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Create snapshots of the disks in the project associated with the VSA proxy.
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From these snapshots, create disks in the destination project selected in the Restore window.
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Create an instance using the configuration from the config file that was backed up.
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Attach the restored disks to the instance.
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In the project that is associated with the VSA proxy, clean up the intermediate snapshot and disks that were created.