If you're an iCloud user this helpful article will be worth your time.
iCloud, however, much like real clouds, is notoriously opaque. It’s hard to see just what you have stored in it. Nonetheless, Apple has made it easy, at least, to fix some truth-related issues in iCloud, and you can do it with a readily accessible tool: a Web browser on any Mac or PC.
Check it out if for no other reason than to give you a little peace-of-mind that you'll be able to get your data if you need it.