melcat Offline Upload & Sell: Off
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I just want to point out that it's possibe to do a "warm backup" to the slower card within the camera. (At least, it was in earlier 1 series.) Instead of setting the camera to write to both cards as it shoots, write only to the faster one, but after a session copy the current folder to the slower card using the menu item in the camera. Then create a new folder on the faster card and shoot to that.
This probably isn't suitable for a professional covering an unrepeatable event like a wedding or sports final. But it is, for example, suitable for a once-in-a-lifetime trip shooting wildlife, when you can do the copy after each outing (zodiac ride, safari drive etc.) If you lose the shots from one outing, another one is coming. Because the cards never leave the camera, you eliminate the chance of handling errors like mixing up or losing cards (actually the largest risk), and you don't need access to another device to copy the cards.
Canon don't say what the camera does if it gets an error on one card when writing to both as it shoots. I'd love to know that the shot is saved to the remaining good card, but Canon don't say that's how it works. If it just stops and displays an error, you've more than doubled your chance of error by using two cards (as you would normally use the more reliable of the two formats).
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