Time machine white list?

Hi, I am currently investigating the best method for providing some automated backup facilities for our faculty and staff members. Currently users who are using PC's have the ability to use Windows File Syncing to backup their 'work' folders to a server, and I have been asked to propose a way to let our Mac users do the same thing. I have experience with using mobile accounts, and that will be one option that I put on the table, however I would also like to try and make use of 'network' Time Machine. My issue is that I would like to be able to designate which folders to back up from a client's machine (i.e a white list) rather than which folders not to back up as is the current way. Is there a way to modify .plist files to allow this - kind of like 'back up nothing EXCEPT for this path'? Any guidance here would be much appreciated. thanks paul