Do I need to back up files that are already in cloud storage?

Author's Note

When I started researching this article, I thought it did not apply to me yet, although I might learn something that would change my practices. My first surprise was the realization that through e-mail, social networking and a blog, I am already using cloud data storage.

I learned that cloud computing is rapidly evolving, and that today's best answers might not apply a few years from now.

Probably because things are changing so rapidly, I did not find definitive answers to the question at hand. The general consensus is that for most people and most data, professional cloud storage is at least as safe as the alternatives. I talked to some computer professionals, most of whom were willing to share their opinions but did not want to be cited as sources.

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