For the moment, the Barefoot collection does not introduce any new functionalities to Backbones collection. But to keep things straight when building your application with barefoot, Barefoot.Collection is also available :)
If you are interested into how a collection is synced on the server, have a look at Barefoot.APIAdapter.Server.sync
During startup on the server, this function replaces Backbones own sync implementation to shortcut “local” API calls.
function sync( method, model, options )