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Disk-to-disk-to-tape (D2D2T) is a data storage and backup technique where data is backed up on a disk before it is copied to a backup tape device. This data backup process temporarily first stores the primary disk content to another disk and then to the backup tape device.
D2D2T is a disk staging technique where an alternate storage medium is used before data is backed up on a storage tape device. D2D2T works when the data of the disk that is being backed up is stored on another disk that has similar or greater capacity.
Typically, the intermediate disk holds the backup content for several days or weeks and gradually transfers the data to the storage tape, eliminating the need for routine interaction with the tape and reducing tape drive wear and tear from frequent use.
In the event of quick restoration, the intermediate disk provides more rapid data transfer rates (DTR) than a storage tape device or drive.