Currently device mirroring is supported only in backups. However with advancement os StoreOnce (and other disk based devices) backup to disk and then copying to tape is also very popular.
One pain point however is, for the object copy, device mirroring is not supported. i.e. when the customer wants 2 copies of his data on tape, it is easily configurable during backup time. But for object copy one must run a separate copy job (probably same job once more, or most likely a post-backup copy job after first copy job).
This whole excercise can be avoided if mirror device support is supported in destination tab in object copy, thereby making copy windows smaller.
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