You can register 2 devices of yours. For example 1 smartphone and 1 notebook (as a back up). You will have all your 2FA codes in both devices, and you will disallow that someone add another device. For example, if a hacker steals your password, he won't be able to access any of your 2FA codes as he can't add another device without your permition from an allowed device.

This is the difference between GA and Authy: You have the security that a hacker cannot add another device even if he steals your password, and you are still able to access your accounts if you lost one device.

If you lose your phone, just buy a new one and add that new phone from your allowed device.

Much better than GA.