1: Don't use Coinbase at all
Not just coinbase but all the online wallets and exchanges are risky to store your coins on them. But we cannot live without them because we need some of the coins to be on exchanges or on online wallets for many purposes including send/receive of the coins.
I would recommend to keep small amount on coinbase and keep your major savings on hardware or desktop wallets.
Why so? If we want to exchange, we can just deposit and exchange. Well, if you're trading there to earn profits then that's another story. But if trading is not someones occupation, there's really no need to store any funds on any exchange. I targeted mainly on Coinbase for it being widely used.