> There are generic database replication tools. These tend to work by
> polling and comparing tables. This is quite performance intensive,
> especially if the replica is to be kept reasonably up to date.

There is a specific InterBase/Firebird Replication Tool that you can try:
http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_replicator

There are also some others that you can look at:

http://www.ibphoenix.com/main.nfs?a=ibphoenix&page=ibp_repl_tools

Paul