New ask Hacker News story: Ask HN: Tool to find identical file subtrees scattered over disks

Ask HN: Tool to find identical file subtrees scattered over disks
2 by b20000 | 1 comments on Hacker News.
Over the years I have made backups of backups, over multiple disks, moving to different computers, and the result is now that I have multiple identical subtrees of files in several places, without a good way to detect which trees are a subset of other trees. I have been searching for a long time for "really smart software" that can help organize archives of work files and detect identical subtrees and subtrees that are older versions of newer trees etc. Does anyone know of commercial/open source tools that help with this?