You can export the photos and videos that you backed up to Google+ photos. You can use "Google Takeout" to download your Google+ photos. To do so, make sure that you are signed in to the Google account which is associated with your Google+ profile. Go to "Google Takeout" i.e https://www.google.com/settings/takeout/custom/plus_photos and follow the instructions.
Google Takeout allows you to export the data to a downloadable ZIP file. You can select different services to export data. You can download your data from Google+, Google Drive, Gmail, Blogger, Google Buzz, Calender, Contacts, YouTube, Picasa, Google Voice, Google Profile, Latitude and more.
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