Just saw this at MacRumors.
While not exactly what I had in mind, it's close. And kinda cool that Apple is doing something in that area (allegedly).
If these are truly to be "post-PC" devices (and if most people have more than 5GB of music, photos, etc.), Apple should come to realize that augmenting iCloud with an iOS-friendly version of Time Machine/Time Capsule is the next logical step. IMO.