Duplicates taking up tons of space on your home NAS?
fclones quickly identifies duplicates, even when there’s 10s of thousands that you’re scanning over the network:
fclones treats your data seriously. You can inspect and modify the list of duplicate files before removing them. There is also a –dry-run option that can tell you exactly what changes on the file system would be made.
Also check out the algorithm used to detect duplicates.