Google Takeout is a service that allows you to archive all your data stored on a particular service offered by Google. For example it allows you to download all your Picassa, contacts, documents on Google Drive, list of feeds on Google Reader and more. Now it has added Google+ Pages and Blogger (blogspot) as services whose data can be archived or downloaded and stored locally.
How to Download Google+ and Blogger Hosted Blog
I have found Google Takeout very useful in the past to transfer my Google+ circles and followers from one account to another.
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Link: Google Takeout
-- This Post Backup Your Blogger and Google+ Page Data with Takeout is Published on Devils Workshop .