Greetings!
Granted, the failure of a drive is not very likely, and that backing up to a hard drive (preferably a desktop) is the ideal solution. But with larger drives getting much cheaper, you have to wonder "why not?". I can think of a few possible uses for this technology, including creating a clone or a hard backup of your empeg (sync, generate mirror drives, break the mirror, physically remove a disk for transplant or storage).
I honestly don't see where a mirror would be used much in day-to-day use, except for the extremely rare instance of a physical drive failure and quick recovery from that situation. But then, I never expected to be playing PacMan or having clear illuminated buttons on the empeg either...
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Paul Grzelak
200GB with 48MB RAM, Illuminated Buttons and Digital Outputs