Card failures are rare and you're pretty unlucky to get them, I'm just far too paranoid. It is something that I think about when using my EM1 on holiday though. In fact I take several 8gb cards and swap them frequently so if a card fails I don't lose all my holiday pics.
Even currently writing to two cards, if I've shot something unrepeatable and I have my laptop with me, I will wiz through what I've shot in Photo Mechanic just to make sure I have useable shots before leaving. If paranoid with the D7500 I would simply rotate two high capacity cards when ever I have a spare moment, 'just in case' for some peace of mind. The more I think about it a single slot should be acceptable for my use.
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