When you associate a folder and sub-folders, there you see an option to ‘Auto Add Sub Folders’. Check Mark if you want PicBackMan to automatically add new sub folders or you can choose to select them manually. Look at the image below for reference.
PicBackMan is a free photo/video uploader that helps you to keep your memories backed up to your favorite online services.
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... an excellent job of uploading more then 300GB of photos to 2 different services