I find that a lot of developers will use the briefer implicit return form (`transform => backup.sync(transform)`) of a function without focusing on whether the returned value has significance.
I wanted to write out the explicit `return` form of the handler to emphasize that returning a promise in an Orbit event handler has significance. It delays resolution of the event, thereby allowing listeners to participate in that resolution.
Perhaps it was unnecessary for me to _also_ include the implicit return form in that example. However, that's the way I would normally write this function, and I'd like to present "best practices" and show how concise the code is typically.
