Our website provided a free download of CopyDrop 2.8 for Mac. The application lies within System Tools, more precisely File Managers. This free Mac app is a product of Hand Held Film.
From the developer:
CopyDrop is a Finder-based no-frills backup utility intended to be used for user folders, media files, applications, or documents of any kind.
The concept of CopyDrop is to make it possible to use the Finder to drag and drop folders, volumes, and files in order to make "smart" copies of them, meaning that identical items already in the destination are not re-copied, saving time.
You may want to check out more Mac applications, such as pdf-FieldMerge or Catenator, which might be similar to CopyDrop.