Use this program https://code.google.com/p/winauth/ Then make sure after you add all your secrets to it, then back up the winauth.xml file which houses our your secrets from %appdata%\winauth
Also has password/encrypted option and allows you to tie to the PC in question if so desired.

As others have said backup the secrets or QR code and you can also use another phone or tablet to house your info in Google Authenticator or Authy < which you can set to backup your data. Authy also allows you to set a pin # for the program, GA doesn't but you can download a 3rd party app to do the same.