DFS with SBS 2003 and Server 2008

We currently have a SBS 2003 SP2 server. we are looking for a solution to provide redundancy in the event of this server being down. Adding an additional server (DC) will resolve Ad issues but we would like a method to duplicate data access as well. DFS would seem to be a possible answer can anyone suggest the best method to incorporate this solution. Would we need 2 additional servers running Server 2008 and the data shares to be on them?
Would the SBS 2003 server be able to have replicated data on it as well. Many thanks.
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