unraid nas duplicate files controle

[Drakenstrijder]

 

Hey. i want to make an unraid nas for all my data to be set up. unfortunately I have a lot of duplicate files on multiple hdd / usb. do you know if there is a good (free) program for detecting duplicates to remove them

[Eigenvektor]

CCleaner can do that, apparently:
https://www.ccleaner.com/docs/ccleaner/using-ccleaner/finding-duplicate-files

though that's a manual process