@Bob Bobson
VSS is a completely different, whilst very useful technology.
Time Machine is incremental backup using a fancy interface, file and directory linking and some meta data.
VSS allows disk writes to be buffered and managed so consistent disk images can be taken.
To all the OS warring people, you should be happy that any of this technology works at all. Marvel at the fact that hundreds of thousands of electrical wiggles a second allow you to blow smoke up each others arses constantly on this tired and boring debate. Then go outside and get some fresh air.