PicBackMan’s Google Drive uploader for Mac is an easy to use tool to bulk upload, bulk download and migrate Google Drive photos to any other specified online service or cloud account. Using PicBackMan for Mac, you can effortlessly backup your entire photo collection. The automated program will keep a check on any new addition of the photos or sub-folders in the associated folders. As soon as it finds new photos and folders, they ‘ll be automatically uploaded to your Google Drive account.
Here the video Tutorial link that you can refer
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