It isn't a requirement, but they all provide apps that allow you to sync, and when you download any file, you're downloading a local copy of them. The people wh

It isn't a requirement, but they all provide apps that allow you to sync, and when you download any file, you're downloading a local copy of them. The people who know how to properly secure files aren't the same people reading and deriving value from this article. Sure, you _can_ be more secure by using these services, but you aren't more secure simply by using them.