Hyperspace searches one or more folders for files with identical content. If such duplicate files are found, it can free up the disk space occupied by all but one copy of each duplicate — without deleting any files themselves!
The core of this functionality is that Hyperspace utilizes a standard feature of the macOS file system: the space-saving “file cloning” technology. This is the same underlying principle used when you copy a file in the Finder. For more details, choose “Hyperspace Help” from the application’s Help menu, or visit the official website.
