Danger Of The Cloud (Question)

Well today I found out that one day a Cloud service could die. I have been using the Ubuntu One File services to use as a cloud backup. But today I got a very interesting email (picture below) that they are shutting down. Now why is this important? Because what if DropBox, Copy, or any other cloud service did something like this? Well, it holds all our files up in the cloud. Some think this is a good idea to use it as a backup. Yeah, cloud backup is a cool thing, but unlike a external drive, they will not cancel services on you, and delete your files. This is just like if my external drive was tossed into a river. Should we trust the cloud? Well today I learned NO!