The best practice is a piece of paper with backup codes on it. And if you don't store that properly, you're out of luck. Nothing is perfect, but paper in a safe

The best practice is a piece of paper with backup codes on it. And if you don't store that properly, you're out of luck. Nothing is perfect, but paper in a safe is pretty good. The cryptocurrency world has introduced titanium backup code holders, where the code letters are literally etched into titanium. Bullet proof, fire proof, etc..