Is there any limit to number of folders associated?

Honestly there is no limit to it. You can associate and add unlimited number of folders and sub-folders. You can add as many folders as you wish to.

Your photo backup assistant

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.

Kip Roof

   ... an excellent job of uploading more then 300GB of photos to 2 different services