In my time working with computers as a consultant, (20 years), I have seen three on-line solutions simply disappear from the "cloud", ie internet. One was soliciting and storing files for professional photographers. One, I personally had files stored with.
Interesting thing about hosts and storage sites that fail on the internet. They commonly do so without notice and are simply one day no longer available. Have you ever tried to run down the owners of a web site that disappears from the internet?
Sorry, but for me, the "cloud" which is simply a new moniker for the good old semi reliable internet, may be conveniant, but it is not secure by the standards I would demand in my own business.
Show me a web site that will divulge their financials to me and give me a tour of their "redundant" systems and I will show you a web site that I will actually consider for storage. For security.. well, hmmmm?
BTW, the last failed photo storage system I encountered was about 5 years ago as I recall.