Tip: You can bulk export your google authenticator app secrets for a disaster recovery like this. I had not seen this functionality before but I'm glad it existed when setting up a new phone yesterday. I remember the old high friction way of having to deregister and reregister for each account.

Howto:

  ... menu in top right -> export accounts
  make sure all are selected, select export
  It will generate a series of dense QR codes.
  Screenshot / photograph / add to backup phone, save and print for your document safe, whatever.

Of course, this doesn't help if you're already in a loss situation. But recovery this way is SO much easier than typing in a backup code. Recovery is as quick as having the app scan each of the QR codes in sequence. For me it was just 3 dense QR codes.

I was a little surprised that it was this easy to extract all the secrets. I'm going to have to think even more carefully about what TOTP secrets go in there now.