DFS-R hub server - which way to make read-only?

Hi all,
This is more of a technical clarification than a problem we're having...
Firstly, we have a bunch of file servers in various EMEA regions, which are set up to replicate back to a central hub server at our UK datacentre in order to take backups. These spoke servers are the only location where the data is changed.
We are in the middle of migrating the hub server over to Windows Server 2008R2, meaning we can use the supported one-way replication method instead of disabling one end of the member connections.
My question is this:
Which member do we need to make read-only? This would have seemed obvious to me, however there is some confusion amongst our systems engineers.
I would have said that you make the spoke member read-only, as you don't want the hub replicating anything back to it. This makes perfect sense to me, but not everyone is so sure.
Could someone please clarify?

I think it is what I want to achieve - many remote spoke/writeable downstream servers talking with one central/hub server so only this hub has the content of them all - but what do You mean saying "configure
your DFS targets ... such that the HubServerB is disabled"? Isn't it by making it read-only?
I've just found this -
Make a Replicated Folder Read-Only on a Particular Member (http://technet.microsoft.com/en-us/library/dd759239.aspx).
Well. There is a clear explanation that users cannot add or change files on read-only replicated folder but all three examples show remote servers as read-only while hub server is always writeable, isn't it?
RODC example is clear - for safety reason no user-made changes are allowed on remote DC but it gets changes from writeable (central/hub) DC/DC's.
Reports files generated and changed only on hub server - OK. But I can imagine an opposite situation where branch offices are responsible for producing and changing reports which are read-only in company's headquarter. Do the remote offices do it all on the
hub server? Then the reports are replicated to remote read-only member servers? What for?
But keeping installation files on remote servers is not understandable for me. I would rather keep them on central/hub server and propagate them to remote servers and make hub server read-only to prevent from backward replication.
I'm not a native English speaker so maybe I don't get the exact sense of this article. Somebody help me, please?
Krzysztof

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