Sandisk/WD have announced a 1tb card, this got me thinking with the new A99 and the rumoured A9 with we hope 2 card slots as well. Although the card is very expensive a set up where the camera stores the same images to two cards it makes a brilliant back up card. You could have it permanently in the camera with the advantage of no risk of dropping it but frequent changes of the other cards to reduce the risk of in the field card failure. I would not be too keen on keeping the card in a pocket of a bag as the only card being used drop that and its a lot of information lost. The tech behind it could be used to make a small back up device like the Hyperdrive things but the size of a smaller smart phone superb if wanting to travel light, one could be made with say 1tb internal and 2 card slots for overflow storage or 2nd back up. The last idea was camera makers could build the storage in to the camera, perhaps as a faster secondary buffer if it missed out the hardware to write to an inserted card could it be faster. If it was just not so expensive.