Auslogics Duplicate File Finder is a free program that finds duplicate files on your hard drives. I have many files backed up, and sometimes I have way too many redundant files. I just recovered 20 GB of hard drive space by deleting duplicate files that this program found. The main thing to remember, is to check “all files” and “match contents (slower)” to really run the best search possible. This application runs in Windows XP, Vista and Windows 7.