[Samba] Samba AD auth - Backup?

[Mark Adams]

Hi All,

I haven't been able to track down any info on this so would be
appreciative of any input. Links to any info on this would also be
appreciated.

Samba 3.2.5, Debian 5.0

Question 1;
Is there any way of setting up a "backup" windows domain controller in
the samba config? so if they main dc is not available, it automatically
queries the backup?

Question 2;
What is the best way to back up the UID/GID map? and can it be easily
imported back to a new install if the server fails for any reason.

Thanks
Mark