Steve Heller (the autor of C++: A Dialog, Optimizing C++ and many other great books) announces the release of UltraDedup http://www.ultradedup.com.

UltraDedup is a command line program created to ease the storage of backup files of VMWare virtual machine files  by compressing and/or removing duplicate data.

A command line example that will create a Chapter (= a collection of files) in an Archive and place two files in it:

     ultradedup p "f:\MyArchives\VHD_Miller.ud"

          –n "Some chapter name"

          –d "f:\SomeDirectoryName"

          -f "SomeFile.txt"

          -f "SomeOtherFile.idx"

          -dedup 0