It depends on why you're replicating but I would say in most cases you don't need to. If you're forking your DB (i.e. there will now be two copies that will di

It depends on why you're replicating but I would say in most cases you don't need to. If you're forking your DB (i.e. there will now be two copies that will diverge from each other) than sure, you would need to replicate your filesystem. But that's not complicated (copying directories is a solved problem). If you're talking about replication for performance reasons, then DB replication and file replication aren't necessarily going to go hand-in-hand, and the solutions are going to look fairly different (for web apps, "file replication" probably looks like a CDN).