In replication sync views it is only possible to define a whole repository as replication target.
It would be nice also to be able to specify a branch subtree. This will be very handy when you want to make a light weight synchronization of a huge repository with a laptop or some other entity that doesn't need gigabytes of testdata or years of changeset history.
I don't want to waste solid state space on my laptop to have an entire project history, though I do want that history to be available on the main server.