Client / Server Architecture

Server can run as an Apache module, using WebDAV / DeltaV, giving you all of Apache's fine-grained configuration and access controls “for free”
Server can also run over SSH (very similar to CVS) or on a local machine
Client keeps a lot more data in the working copy than does the CVS client, so you can actually get some work done off-line!
Client and server were designed to use bandwidth efficiently, by transmitting diffs in both directions whenever possible

Server can run as an Apache module, using WebDAV / DeltaV, giving you all of Apache's fine-grained configuration and access controls “for free”