This question already has an answer here:

Does a wallet in blockchain.info My Wallet contain a pool of extra keys as in bitcoin-qt?

Should the wallet be backed up after every new address is created, or only after several are created?

marked as duplicate by o0'., Meni Rosenfeld, Nick ODell, ThePiachu, Highly Irregular Feb 12 '13 at 2:08

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • (partial duplicate, I'm unsure if it should be closed or not) – o0'. Feb 10 '13 at 18:22
  • 2
    A duplicate all right. Now why didn't I find it in search? Edited a bit the other question. – Meni Rosenfeld Feb 10 '13 at 19:31

It doesn't (or, at least, didn't).

Email backups will be sent to you every time you create a new address.

Not the answer you're looking for? Browse other questions tagged or ask your own question.