We are getting more and more questions about iCloud, and if you go through the icloud you will find a lot of them relate to people misunderstanding iCloud and how it works, including backup.
On SU we handle these by creating a canonical question which we can use to close all these questions and not have to repeat the answers.
(I have answered a few of these and I often copy and paste from my previous answers)
Thoughts? Ideas? Should we do it?