Thank you for your answer guys.
I found my blockchain email
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)
You should back up your wallet regularly.
If you have a copy of your wallet stored somewhere safe, then you'll still be able to access your bitcoins even if blockchain.info disappears completely.
Sorry, how to do that ? I think blockchain is secure, I don't use pc wallet because i am afraid something happen to my pc.