StorSimple as Virtual Tape Library
As written here http://feedback.azure.com/forums/258995-azure-backup-and-scdpm/suggestions/6831679-storsimple (sorry for cross-posting) I think the StorSimple Device is perfectly suited to act as a Virtual Tape Library i. e. for DPM.
Maybe something for future releases.
Lorenzo Dalci commented
As a VTL it could also be presented to IBM Power Systems...
Does Microsoft have any plans to offer Stporsimple with VTL capability, or a software-only option (installabel VM) perhaps?