Flickr allows you to upload, access, edit, organize and share your photos and videos on any device, from anywhere in the world. You can find stunning photos shared by a community of professional photographers. To learn how to backup photos from Flickr to Google Photos on Android phone.
PicBackMan is a free photo/video uploader that helps you to keep your memories backed up to your favorite online services.
Users in 130+ countries have backed up.
... an excellent job of uploading more then 300GB of photos to 2 different services