I've created a new address on my wallet and in 5 seconds blockchain.info emailed me a backup of my wallet twice. Is this normal? I haven't requested it.
I am not a fan of keeping a wallet backup on my mail since it can be hacked.
Edit: I just received another wallet backup to my email. This is the third time.
Yes, you get an automatic backup every time you make changes to your wallet, just store it in a safe location.
If you don't trust that email account maybe you shouldn't be using it on Blockchain.info.