Content Deduplication

Deduplication is the process of removing redundant content from your collection. Some file systems (e.g. zfs) allow automatic disc-level deduplication, although enabling this feature requires additional memory useage. Various tools exist for detecting and deleting duplicate files:
 * CCleaner has a built in duplicate file finder.  Allows detection of duplicates based on file contents, file name, file size, and creation date.
 * Auslogics produces a Duplicate File Finder tool.
 * fdupes on github allows recursive detection and deletion of duplicate file contents
 * ssdeep
 * fslint