I do not think Mac supports roaming profiles like Windows does. It is documented here:
http://samba.org/samba/docs/man/Samb...ofileMgmt.html
Why you need this feature? Is is because your users login to different pc`s all the time?
I do not recommend using roaming profiles. It creates more trouble than it solves. Keep it simple, that works best.
I would recommend just creating a home-share for all your users and make is auto mount on your clients when they login.
If you want your users to have offline capabilities on the data, then I would recommend looking at services like dropbox. This is a great utility you install on any computer (mac, linux, windows) and it will make data sync automatically to all computers (This is a paying service if you exceed 2GB).
If it is centralized backup you are looking for, Crashplan is a great alternative to look at.
/MartOn