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I'm looking for a tool that will

  • detect duplicate files or folders,
  • delete them,
  • but before deletion will copy the file to backup folder just in case the program made a mistake and detect a non duplicate file

Is there such a tool?

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since you tag this folder I guess its Windows platform then -- always good to declare that part –  nik Sep 16 '11 at 15:16
    
Based on the other question I assumed Windows. –  slhck Sep 16 '11 at 20:38
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1 Answer 1

When I need to find duplicate files over my machine I use Fast Duplicate Files Finder(Im using a free version). Here is a simple information about:

Fast Duplicate File Finder FREEWARE will help you find fast all duplicate files in a folder and its sub folders. The application will compare the content of your files so it will find duplicates even if they are using different file names. The Professional version can even find similar files regardless of their file types. It will analyze the content of the files in order to find similar files and not just file attributes like name and size as the standard duplicate file finders do.

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