Blogo kindly saves your posts on to your computer, if you want access to them just follow these steps:
1. From your Mac's Menu Bar, select "Go".
2. In the dropdown menu that appears, click on "Go To Folder".
3. Copy the path "~/Library/Containers/com.blogo.Blogo/Data/Library/Application Support/Blogo/accounts/" into the text box, and press Go.
4. There you have each of your Blogs posts stored in their own folder, under the Blog name.