[Samba] samba acting as bdc

[Michal Gubik]

I set one samba3 as pdc  but I have 2 subnets each in different location 
and upgrading  the profiles take to much bandwith and in case the 
connection between those subnets is down they cant log on to the 
domain.. Is it possible to set another machine on that subnet as bdc 
that would have backup of the profiles used for those local users taken 
from the pdc?? I searched for it but found nothin.
Michal