Ryan Sexton - 2014-05-12

So as the subject says I'm trying to sync 2 similar 7z files and wondering if its possible with commands because I don't see a way to do it through the GUI.

The full situation is that I am compressing a large file share to a portable drive and then taking the portable drive to an off site storage drive and would only like to have to copy the full 7z file once. After that I can sync the files to the 7z on the portable and then sync the 7z on the portable to the one on the storage drive.