One is just fine!

NoClone - uncover true duplicate files; recover valuable disk space.

Features and benefits

Accurate True byte-by-byte comparison, not CRC / MD5, totally accurate. No false duplicate files Works with any file types Search duplicate files contents and similar files regardless of file name, file size and date Search duplicate pictures (jpg, gif), video (avi, mpg), songs(mp3) , DLLs, Office documents(xls, doc, ppt, pub), pdf and any file types Powerful fuzzy match Similar file search - sophisticated and efficient file similarity comparison function;  Discover duplicates Find duplicate and similar files for file management, document management, digital forensics and plagiary detection Time-saving Smart Marker - filters duplicates by date, folder, file name, size, file name length Mark all except one Recover disk space / de-duplication Delete to recycled bin; delete permanently; move to archive Replace by NTFS link / shortcut (remain same path to access files) Flexible search criteria Multiple path search, exclude, search against master folders Define your own duplicates: by file name, file size, contents, date Mange file Uncover different versions of master files Ensure single instance Duplicate Outlook emails Find and remove duplicate emails Search across network paths Search over local area network (LAN)   Save search session / Export result to CSV, XLS, XML format Screen Shot: preview picture and photo files internally.