PicBackMan’s Dropbox uploader for Mac is an easy to use tool to bulk upload, bulk download and migrate Dropbox 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 Dropbox account.
Here’s the video tutorial you can refer to