CloneSpy will free up drive space on your PC by finding and removing duplicate files. Clonespy is also able to find files that are not exactly identical, but have the same filename. This allows you remove any older versions. Furthermore Clonespy can find zero length files. Those are files that do not have any content. Altogether with CloneSpy you can process files which - are duplicates - have the same file names - are duplicates and have the same file names - are zero bytes long.