writing async Repository methods inside my asp.net mvc5 web application

I am working on an asp.net mvc5 web application + Entity Framework 6. and I want to have a repository model class inside my application. currently I am following this approach to have async action methods and async repository model class.

for example I have the following repository save method:

public class Repository
{
    private Entities t = newEntities();

    public async Task Save()
    {
        await t.SaveChangesAsync();
    }

which I am calling from my action methods as follow:

Repository repository = new Repository();
 public async Task<ActionResult> GetResourceByName(string resourcename)
      {
         await  repository.Save();
      }

so is this a correct approach? as I am doing the following:

1. I define the repository method as a Task & also the Action method as Task. so should I have both of them as Task(s).?

2. I am using await twice on the action method (when calling the repo method) and on the repository? so are these await redundant?

//please note that this is only a simple example of a repository method which is just used to save model,, but I am asking about the approach itself as I will be using this approach in a more complex repository methods ..