HOW TO: BACK UP YOUR GOOGLE+ DATA USING TAKEOUT™
You may have heard of Google's Data Liberation Front. The first product from this special ops unit is called Google Takeout and it's surprisingly effortless.
Here are the steps for liberating your data; also useful for backing up contacts and links you may have shared on the network.
1. Visit http://google.com/takeout
2. Click "Create Archive"
3. Download your files
The Google archive contains options for saving your Google Profile, Stream, Contacts and Circles, Picasa Albums, as well content from Buzz and +1 if you have these enabled.
Contacts are organized by the names you have given to your Circles and stored as .vcf cards. Picasa Web Albums are organized by Album Name or post date.
Whatever you have published to your Stream is archived as .HTML pages complete with images and comments. If you have reshared items, these pages are also part of the archive.