It will also provide you with 16 "recovery codes" which can be used once each in the event you lose your phone or other 2FA device. Much like your mnemonic seed, you should write these down on paper and store them somewhere safe (not electronically).
One additional and confortable way to back up your 2fa is to use Authy. Authy allows you to save your 2fa codes in your account, so you can multiple devices as a back up. It is not as safe as writing in a piece of paper... But after adding the devices you can disable "add new devices" function, so at least in theory nobody would have access to your account in a new device.
I made a small topic about it here
https://bitcointalk.org/index.php?topic=3178131.20