Building frontend + backend : best practices ?

[eluser]Isuka[/eluser]
[quote author="Bramme" date="1224283728"]In the end, the backend is a supporting feature of your frontend, the two are meant to be used together...[/quote]
You're right, the backend is a feature of the frontend.

But, for me, a backend has it's own views, models, assets (css, js and images), it's own config files, libraries and helpers that they don't need to be in the frontend.

In my opinion, a frontend model for exemple don't need to have the methods specific to a backend model, like a save() or update() method.