[avh02]

When adding 2fa I add it to authy on my phone and to my pebble (which has significantly better battery life than my phone).

Authy allows backups though I've never tested this.

I also keep recovery codes for critical services in case all else fails (just don't forget to NOT put that behind 2FA cos circular dependency)

[jetpackjoe]

For what it’s worth, when i switched phones my Authy app went out of sync. It was a work account so I just had my boss reset my 2fa, but if there isn’t a way to re sync you may be out of luck.