Solution 1:
I believe that Duplicati meets all of your specifications http://code.google.com/p/duplicati/ - it supports VSS, uses deltas and has a commandline client in addition to the GUI.
Backup client for Windows: open source, rsync and VSS
Solution 1:
I believe that Duplicati meets all of your specifications http://code.google.com/p/duplicati/ - it supports VSS, uses deltas and has a commandline client in addition to the GUI.