This service allows for support of MicroContent in a totally different form. It took me some time to realise it and probably I do not get it yet fully.
So I did some experimenting on my homepage on Backpack. I can not fully experiment with it on a Free account. The system is very similar to a Wiki (multiple editors) or a Homepage builder. A web-page can contain a body, a list (multiple text entries), a note (title+body), files (links to) and images (multiple).
One could see a single page as a MicroContent type. Each page equals an Item. And the user can add multiple pages. But maybe this stretches the idea of MicroContent to much. Many things are lacking in support and publication possibilities.