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Another thing to think about: most physical media are magnetic in nature, which means an EMP pulse (sun flare or military) can fry it permanently. CDs are optical, but they have severe longevity issues, at least those from common CD burners. They oxidize and can become unreadable within 5 years.
When it doubt, carve your data in stone. As new ways to store information are developed, they are invariably:
- faster to write
- faster to read
- less durable
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