If you have a large number of Subscribers in your FeedBurner Account and want to take a backup of your Email Subscribers, than simply follow the given below steps and you are done:
1.Login to your FeedBurner Account via your Google Account Email and Pass
2.Go to Publicize >> Email Subscriptions >> Subscription Management

3.Scroll down to the Total Subscribers >> View Subscriber Details finally click on “Export: CSV” link.

4. Finally you are done.
