Rsync for Windows... very useful for backing up PCs... with BackupPC...

http://www.aboutmyip.com/AboutMyXApp/DeltaCopy.jsp ==> seems to be the best of the two… because it’s a native compilation…

http://www.itefix.no/i2/node/10650 ==> package compiled with cygwin… and the tool for backing up PCs…

http://backuppc.sourceforge.net/