master-slave solution

I am planning out a solution using master-slave replication, possibly with Pressflow 7, and wanted to do a reality check that the approach makes sense. I'd greatly appreciate your feedback, even though my use case is not particularly high performance.

My client uses a browser-based application to do data collection in remote locations. These 'satellites' have web access about once a week. Currently, they are dumping a SQL file, emailing it, and manually updating the master server. Ideally, the master and all slaves will be kept up to date with the complete DB as much as possible.

Hi,
Please bear with me if i am creating this question in the wrong place i am new to Drupal groups.
I manage an enterprise solution for 4 drupal sites very high transactional and with high traffic.
i use pressflow on 6 web servers with memcached and a master slave replication, they seem to be fine but i want to reduce the load on the master so i want to make 2 slave part of the solution, since i am using pressflow with supports master-slave replication solution.