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If you desperately want to use SD Cards or USB drives/flash drives go out and by three high quality ones
The smartest thing i have heard today. I recommend the same approach, but instead of flash drive can be used quality CD+R disk. You can add information to it, with no afraid to erase previous session.
How long will a CR+R disk last compared to a flashdrive?
A CD will probably last more, i have a Bach Concert cd from 87' and it still works
it depends on the quality of that disk too. i have a bunch of CDs that had some valuable stuff on them and i don't know if they were shitty Chinese product or what but they stopped working after a couple of months!
it is always best to keep additional backups from a sensitive information like private keys which are holding your money!
p.s. your CD is as old as me
