The documentation on these frameworks isn't great. In fact, it's downright horrible. There are no conventions or standard practices and every tutorial I can find builds an application with these frameworks in a different way.
Best practices - I stick to simple rule of using Views (in backbone) and view models (in knockout) to interact with dom, then using models in both frameworks to sync w/ DB. This keeps code fairly clean, and use of other components of framework relatively straightforward.