[SketchySeaBeast]

My paranoia about my devices stability and its 2FA software (LG G4 bootloop victim) means that I keep two phones with 2FA verification and applications enabled - one stays safe at all times so that in case I lose or drop my new one I can use the backup.

[jacobsenscott]

I've lost my phone and been able to re-connect to every 2FA service I use without any need for human interaction. For google I was saved because my laptop was still logged in and I could turn google's 2fa off.

Basically everyone else has an "I lost my device" thing and a fallback to SMS codes or email links. This certainly weakens 2FA in general, but strict 2FA is unusable in practice.

[lordlimecat]

Just store your 2fa totp key or qr code or backup somewhere that is either protected by 2fa (password manager, online storage) , or is available offline (file cabinet).

Some online storage services have secure areas requiring 2fa to open which would be suitable.

[Klathmon]

Most services that use standard TOTP codes have backup codes that you can print out and store in a safe, and the ones that don't you can save the QR code that enrolls the 2FA app and use it again to re-enroll a new device if needed.

Obviously the backup codes are preferred as you're not storing a master key to all future codes, but it's a lot easier to manage than a second device (at least for me).