Google Takeout (also called Google Takeaway in some languages) is a little known service that allows users of Google products, such as YouTube, Google Drive files, Google Calendar appointments, Google Contacts, and Gmail, to export their data as a downloadable ZIP file. It is a great method of keeping backup copies of your online data. Google Takeout makes it easy for you to make copies of your information that is stored in many of Google’s many services. In fact, the service is so simple to use that there is little documentation needed or available. Best of all, the Google Takeout service is available free of charge.
The full list of Google data services available (so far) with Google Takeout include:
YouTube, Bookmarks, Mail, Calendar, Contacts, Drive, Voice, Profile, Hangouts, Google+, Circles, Google+, Stream, +1s, Google+, Pages, Blogger, Orkut, Messenger, YouTube, Google Photos, Google Play, Books, Location, and History.
Google does not delete your data after exporting.