Save your code seeds!

For security reasons, this app doesnt back up the seed/starting codes you use when you add a new service to the Authenticator. For this reason, make sure that you PRINT the QR code from the page youre scanning (Dropbox, Google, Coinbase, etc) and save that printout in a safe place. You will need these printouts to restore your services to Authenticator when you transfer to a new phone.

jemenake about Google Authenticator, v3.0.0