load balancing and sources

Hello,

We will migrate soon our webserver to a load-balanced system with a
Cisco load-balancer.

It will have 2 webservers and a NAS server for files.

How can I replicate changes on the IIS configuration (new sites, ...) on
both webservers ?

What is the best solution to keep the sources up-to-date on both servers
(shared folder on the NAS server ?, mirror with robocopy ?,...) ?

Thanks for your advices,

Fred