I think the dual recording capability of the NX5U is a great feature to have. I certainly have worried about cards failing on me with my HMC. Hasn't happened yet thank goodness. And I have multiple cameras too, but what if a card fails on me while getting an important closeup or fails on the camera with the wireless mics, losing my sound? I love my Panny, but the dual recording sounds awesome!
I very much agree with the idea that having a ready made backup card would be nice, though of course we could add a backup device via the HDMI output too
In terms of your wireless mic - you could have a second receiver on a second camera and there is your backup
If the NanoFlash were cheaper I would consider it as a backup device too - but not at those prices
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