Comparator

Comparator will finds, deletes and copies over duplicate files, it will also find missing files and perform full backup routines. It will shows you a side by side list of the contents of any two files so you can see what is missing and what is new. It can easily sync the files to ensure a perfect match. And here, too, is an alternative to the Microsoft Briefcase, install Comparator everywhere you go to keep shared files in sync.