Just keep a back up of your keys, which you need to generate codes when you log-in and you'll be fine, so even if for some reason you lost your phone or accidentally erase data or delete the app, you can enter that key into another Google Authenticator app and get the codes to login.
What does it mean? Should i have to write each and every code which i generate when logged in the site?
Here's a topic about this subject: https://bitcointalksearch.org/topic/how-to-backup-google-authenticator-201082
You can also find useful information if you search google, 'how to backup google authenticator'.
thanks dear for this thread
