You can specify suitable comparison condition for searching duplication files. It detects, for example, the files that have the same contents (may have different file names) if you specify \"CRC\" or \"Contents\". It also might detect backup copies which have the same name and different contents if you specify \"Name\" and \"Date Created\".
You can delete extra files in the duplication files after checking these by using various functions of DupScan (sorting, preview and open by default application etc.).