[coldtea]

>I guess they want us to hypothesize that magical "Data Fairies" do this syncing?

No, they hypothetize that the average user wants a high level description, not to read about servers, incremental sync protocols, etc.

[PhantomGremlin]

They could have added this sentence, more or less:

   The secret sauce underlying this syncing is
   Simperium, a service for developers to move
   data everywhere it's needed, instantly and
   automatically

One extra sentence would have overwhelmed the average user? Bah.

[coldtea]

That doesn't provide any more information to the average user -- which I thought was what was being asked for here. What's "Simperium"? Just a name they don't know to them.