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- Riz
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Of course its not a deal breaker but it depends if you want that built in insurance or if you want to faff with other methods or possibly even lose clients because of failure, its not just backup, a 2nd slot can act as a jpg slot, overflow or video. Youre not just covering yourself with 2 cards but also have 2 slots if the one failed. I really wouldnt say its a small detail but perhaps some arent concerned. I always back my computer up, why wouldnt I 'back my camera up'.
But there is a flip side to this situation, you should always backup your data off the device that is being backed up (for added security)... so for example my MacBook Pro is backed up to a AirPort Extreme which has a remote HDD attached to it. If my MacBook dropped in a pool the data would be safe.
Having both SD cards in a DSLR and then that dropping in a pool would result in total loss