Ideally I'd like to solve this without having to install new software on
a bunch of windows servers. Part of the appeal of the samba method is
that you never even have to log in to the workstations to set them up,
since the backup user and permissions and shares can be managed through
AD.
We've run into a problem when running backuppc on Windows XP hosts where
many files simply aren't being backed up. For instance if I've got a
directory with MP3s in it the entire directory tree will be created and
viewable in the backuppc web gui, but the bottom level directory will be
empty.