Google Photos is one of the best ways to sync and store the picture you take on your phone, but getting them out of your library is another story—especially if you want to keep your metadata (date, time, caption, etc.). Since Photos no longer includes an option to sync with Google Drive, keeping a rolling backup of your photos is going to take some work.
Here and your options are for creating a backup that keeps your photos and metadata intact:
Google Drive
Storage
Like before, Google will store high-quality photos and videos in Photos for free, so they won’t affect the space in your Google Drive. If you opt for Original Quality, however, Google Photos will use some of the space in your Google Drive to store your library, even though you won’t be able to see or access the photos. Any photo or video that resides in both places will take up twice the space.