>VSS is supported for backing up system files, but not for backing up
>open files. (At least, that's my understanding. We were talking
>originally about ntuser.dat, which is not backed up as a system file.

As I understand it, the essence of the ntuser.dat file is generated into
a Registry key as the user enters into their logon session, which means
that it would incidentally be backed up as a system object at that point.
I don't know how much good such transient data does in a restoral, though.

   Richard Sims