Here is what the backup email from blockchain.info says:
Attached to this email is an AES encrypted wallet backup which contains everything you need to restore your bitcoin balance. You can use it to restore the wallet at anytime at My Wallet or using the 3rd party MultiBit Desktop client.
So my BTC's are safe in the event something happens to blockchain.info as I have email back up yes?
If Blockchain.info goes away, download the Multibit client from bitcoin.org and import the blockchain.info backup. Everything will be there, except addresses created after the backup.