@gerryLowry: Thanks for all the comments pointing these out. The C9 team is looking into this as I write this...
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@wengerit: While not related to this extension, Visual Studio does have a "Auto Recover" feature, that saves the data to your local drive. Check out https://msdn.microsoft.com/en-us/library/208c6tcy.aspx for more information about this feature...
An article that provides great coverage of the Band Studio project was just published, http://blogs.msdn.com/b/italy/archive/2015/04/24/introduzione-a-band-studio-per-visual-studio.aspx
This is a must read if you want to use Band Studio...
@Mike: VS 2013 Update 5 is currently available as a CTP (CTP 3).
I'd guess that it will RTM Build or Ignite Week