Do you mean your private key or seed phrase? Saving it in an online cloud is not that safe. I know they have security procedures, and the possibility of getting hacked into their cloud is low, but still, I am hesitant. I save it mostly on my computer. I know some of you will react, but it makes me more cautious when clicking links and visiting websites. Since 2016, I always save it on my computer. But still, if it is your preference, you can save it, but when it comes to leaving your money on the exchange, do not keep it in online accounts, as Theymos said. There is no need for an explanation; withdraw your funds to be safe.