InstanceSpecification 
    class InstanceSpecification
The instance details to specify which volumes should be snapshotted.
Types
Properties
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                  Excludes the root volume from being snapshotted.
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                  The IDs of the data (non-root) volumes to exclude from the multi-volume snapshot set. If you specify the ID of the root volume, the request fails. To exclude the root volume, use ExcludeBootVolume.
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                  The instance to specify which volumes should be snapshotted.