Hi,
The following items cannot be replicated:
IP pool definitions (for more information, see About IP Pools Server).
ACS certificate and private key files.
Unknown user group mapping configuration.
Dynamically-mapped users.
Settings on the ACS Service Management page in the System Configuration section.
RDBMS Synchronization settings.
Third-party software, such as Novell Requestor or RSA ACE client software.
http://www.cisco.com/univercd/cc/td/doc/product/access/acs_soft/csacs4nt/acs40/user/sad.htm#wp756078
Hope that helps !
Jagdeep