Here is an exciting thing you can do with Copywhiz.

You can copy only newer or modified files by skipping identical files. It is useful if you are backing up your files to the same destination. Only new & changed files are copied.

Also, to ensure that the destination file does not get replaced with an older version of the file, you can skip files that are identical/newer in the destination folder.

Eg. When maintaining a set of music files on yet another drive (USB pen drive, music player, etc), you can select these options to update the collection with only newer or updated files.

Watch a short video (2m 28s) demonstrating this feature.