Agreed.  If you are not maintaining a recent backup of the wallet file somewhere off the blockchain.info website, you are taking a HUGE risk.  What would you do if blockchain.info got shutdown today?  As soon as you get logged in, get a backup immediately.

Note to anyone/everyone who uses blockchain.info and hasn't gotten a wallet backup yet.  Please log into your blockchain.info wallet, and get a backup right now.  Don't procrastinate.  Don't wait.  It takes less than 60 seconds.  If blockchain.info were to be shutdown permanently an hour from now, you'll be happy you took my advice.  If blockchain.info is never shutdown, at least you'll have some peace of mind that you have access to your bitcoins.