[Samba] Upgrade question

[Louis Bohm]

I am currently running Samba 3.0.6 and I want to upgrade to the newest 
version.  But before I do I want to know is there any way I can dump the 
user DB such that if some thing bad happens I could load it into a fresh 
install of samba?
    OS: RedHat 9
    SAMBA:3.0.6
    Passwd DB: tdbsam
The RedHat machine is configured as an NT PDC.  When I upgrade software 
I would like to continue to use tdbsam as my passwd db.

Thanks,
Louis