Arnaud Lacour has written a couple of entries recently on using Directory Proxy Server data distribution to replay the same operations against multiple data sources. The data distribution algorithm in question is referred to as the replication distribution algorithm.
Although the Directory Proxy Server replication distribution algorithm does not handle all the sort of conflict resolution corner cases that Directory Server and OpenDS replication can manage, it does let you perform best-effort replication across supported data sources.
Check out Arnaud's two entries:
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Setting DPS As Replication Hub - Part 1: A Simple Tutorial
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Setting DPS As Replication Hub - Part 2: Replication to SQL and LDAP
