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Paper backups are the best option for this. Private keys are simple enough that a whole wallet can be printed to a single piece of paper using an OCR-friendly font.

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I wouldn‘t send it to a printer (and certainly not generate the passphrase on a computer that is connected to the internet). Write by hand, it is only 12 to 24 words.

You can get a printer without a network port.

You can skip the hardware wallet and print the whole key as a qr code or just text in an ocr font.

Then there's no chance for hardware failure.

A copy could end up stored on the printer's hard drive. Figuring out whether you have a printer where that's possible is more work than writing it by hand.

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