This is really quite an important and interesting article. Especially for those people (includes me) who have habit of keeping unnecessary extra backups in their system here and there. And later they themselves can not figure out which one is the original backup. However the duplicate finder you mentioned is only available with Original Microsoft Windows(Genuine Microsoft Windows). Unfortunately in India, there are a still lot users with pirated versions. So for them this is not available. Further other operating systems such as Linux or Mac there is also need for this type of utility. A search with words "duplicate finder" or some thing similar, in SF.net or download.com can get you third party free duplicate finders for windows as well as other operating systems.