Thanatos,
In the apps themselves point the default save locations to their local drive. Example: in Word, go to tools, options, then file locations. Pick the drive you want to normally save their data to. When the user saves it automatically points them in their first choice, they can however change it to whatever.
Remember.... That data saved on local workstations is more volatile (meaning harder to recover in the event of a problem) than data saved on the server. Workstation corruption happens alot more than on Servers mainly due to the fact that servers once setup don't have alot of more software added to them.