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Message: <blockquote data-quote="Felisek" data-source="post: 348728" data-attributes="member: 23887"><p>If you have a camera with two slots, you can put two 32 GB cards in them and use the second slot as backup. I don't know what chances of a single card failing on a given day are, but I suppose they are rather small, as we don't hear about it all the time. Probability of two cards failing at the same time is the single card probability squared, which is really small. Consider an example where the probability of a card failing in one day is one in a thousand (just a guess). Using a backup reduces this probability to one in a million.</p></blockquote><p></p>