Akavache WP.cs

//in app.xaml.cs
public App()
{
    //blah blah

    BlobCache.LocalMachine = new IsolatedBlob();
}

//my blob class
public class IsolatedBlob : PersistentBlobCache
{
    public IsolatedBlob() : base(filesystemProvider: new Akavache.IsolatedStorageProvider())
    {
    }
}