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What source-to-destination-to-tape backup is

A common variation of the basic data protection backup deployment adds a tape backup of a destination FlexVol volume. By backing up to tape from the destination volume, you do not subject the heavily accessed source volume to the performance degradation and complexity of a direct tape backup.

The following illustration depicts a data protection chain deployment with a tape backup:
SnapMirror deployment: Source to destination to tape

NDMP is required for this configuration, and Infinite Volumes do not support NDMP. However, you can use other methods to create a tape backup of an Infinite Volume. For more information, see the Clustered Data ONTAP Infinite Volumes Management Guide.