Basically, the concept of “the cloud” is a centralized data-storage for documents/databases/media/etc. on the ‘net.
Amazon has been using this concept for some time for Kindle content - with your purchased books being available to all of your internet-enabled devices (not just the Kindle device). They somewhat recently added amazon-purchased music to their version of “cloud” storage.
The general idea is that you can have your music library, video library, ebooks, and whatever documents you want available to you wherever you roam, so long as you have internet access. The logical progression is to have everything that we traditionally have to keep up with (storage) “safely stored” on a server somewhere.
From a convenience viewpoint, this is the coolest, most convenient development in computing in a very long time...
BUT - as others have pointed out - there are concerns with security - both from the ever-present danger of both “private” hackers and data thieves, to government-sponsored cyber-terrorism, as well as the obvious worry about OUR OWN government! Privacy... what privacy?
So, you would only keep what you want to keep on there. My husband has a kindle, in fact, so I guess his kindle stuff is on a cloud somewhere. Does something like Carbonite work like that?
I have a wireless hard drive back up in my house, which I guess is like a little cloud in my house. I wouldn’t trust my own stuff to be flying around in the cyberverse out there, but then, I can’t get to it when I’m not here. If something is REALLY important to me, I wouldn’t just have one copy and it wouldn’t be *out there*.