I am trying to get my head around how one would migrate an existing website to Azure.

I know of the DNN Accelerator, however I don't understand it's use:

I have set up a plain ASP.NET website from VS2013 and published it to a Web Site in Azure (trial). This works fine.

Then I could FTP all my DNN files up to Azure.

So where does the Accelerator come in and how does Storage and VHDs fit into it? (It looks like my Web Site has a file system without a Storage drive or VHD?

Thanks