The Google Photos App for Android and iOS devices is not only a good way to backup your Photos to Google servers. It is also a very good gallery app. A gallery app that automatically stores any Photo you take to servers so when you switch phones, all you’ll have to do is to simply download the Google photos app from the Google play store for Android or Apple app store for iOS, Log In to the same email address you were using before and boom! All your photos gets downloaded from Google servers straight to your phone.
Doing that will stop your photos and videos from automatically backing up and saving a copy of all your photos on Google’s server.