I found this page:
which talks about shadow copy for shared folders...
but then it says 'When you enable Shadow Copies for Shared Folders on a volume, a default scheduled task is also created. The default schedule for copies is twice a day at 7:00 A.M. and 12:00 noon, Monday through Friday.'
I only know of enabling shadow copy by right clicking on a drive, properties, then enable shadow copy. so that's at the volume / drive letter level. but it's only shadow copying the shared folders?! or is that something different. and there's the admininstrative c$ and D$ so in effect, the entire drive IS being shadow copied?