Here when we change tape formats, we duplicate the long term retention
data to the new format.  It's pretty easy with NetBackup, but I suppose
worst case scenario you would have to restore it, then back it up again.
Probably a better question than "can I restore the data?" is, once
restored, do I still have the application that reads that data? I've
already run into this a few times with older Exchange and Oracle
backups. It's a mess.

-Jonathan
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