TOTP seed backup tip: use zbar tools to convert QR code screenshots into alphanumeric format

These seeds are easily saved in a text file (encrypt with GPG) or a password manager (not full 2FA, but better than a password alone).

zbarimg may has trouble decoding some QR codes composed of CSS elements due to tiny borders around the blocks. In that case, apply a small gaussian blur to the screenshot, followed by sharpening. Use imagemagick for more automation.

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