PicBackMan’s SmugMug uploader for Mac is easy to use tool to bulk upload, bulk download and migrate SmugMug 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 to 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 SmugMug account.
Here the video tutorial that 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