Google Photos and SmugMug are amongst the most popular photo storing and sharing websites. Both these websites offer its users a safe storage space to backup photos and videos. Here is how you can easily upload & migrate photos from Google Photos to SmugMug through PicBackMan. PicBackMan allows users to migrate photos from one online account to another without making too many efforts.
Here’s the video tutorial you can refer to
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