File De-duplicator
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This module finds and removes duplicate files used by your Drupal site. It saves disk space by keeping only one copy of each unique file and updating all references to point to it.
The File De-duplicator module helps to find the duplicates among managed files as well as to remove duplicates by merging usage to a single copy of the file.
It will help to save the disk space storage on the server as well as the backup size of the website.