Download a backup copy of LOTS of your Google Data

Just go to https://www.google.com/takeout/ and login.

Many Google Services are supported – Blogger page export was recently added.  You can also backup all of your Google Drive docs and original Youtube videos.  The list goes on:

Some more info:
Google Takeout now offering Blogger and Google+ Page exports –

And some seemingly outdated (?) info at:
the Data Liberation Front