Google Takeout is a service provided to easily download your data from its supported Google products.
From the Takeout page -- Google Takeout is a Data Liberation platform that makes escaping from Google products as easy as possible. Takeout lets you take your data out of multiple Google products in one fell swoop. Moreover, you’ll find that all your data is in portable and open formats‚ so it’s easy to import to other services quickly.
The FAQ link is here: https://support.google.com/takeout/
More information is provided by the Data Liberation Front
