All data media has limited lifespan, that includes SD cards too. Using more than 1 memory card for your pictures is very valid attempt to minimize loss if storage media is lost, but my opinion is that depending on SD cards only applies to pictures that haven't been copied to long term storage. You still have the added risk since there is only one copy of your pictures. There are couple of storage solutions available that don't depend on computers to work.
yours
ZB.
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Sodomy non sapiens. : I'm buggered if I know
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