Microsoft Knowledge Base Article 311398 contains the following summary:
This article describes how to set up replication of your Internet data between servers. The procedures cover the most common method, which is to use Distributed File System (DFS) and File Replication Service (FRS). The Internet folders will need to be setup before performing these procedures. A member of the Domain Administrators group performed the following procedures on a domain controller system running Internet Information Services (IIS) 5.0.