I am using the Windows Live writer to write my blog post. By Default, the post is store under C:\Users\%USERNAME%\Documents\My Weblog Posts
Because I like to use Sky drive to backup my Post, I like to change my default post location to the child directory under the sky drive.
The way to achieve this is to add the additional register key under HKEY_CURRENT_USER\Software\Microsoft\Windows Live\Writer
The Key string name is PostDirectory and the Value is where you want it goes.
Once you restart the live writer, it will create 2 child folders , Drafts and Recent Posts.