Microsoft has released two hotfixes for Data Protection Manager 2006

DPM 2006 Hotfix: Receive an Error Message and the Replica State is Invalid (KB911169)

In the Alerts pane of the Data Protection Manager window, the replica state is invalid and you receive one of five error messages. This download contains a DPM hotfix that resolves this problem.

DPM 2006 Hotfix: Receive an Error Message and the Replica State is Invalid (KB911169)

DPM 2006 Hotfix: Stored Shadow Copies are Overwritten (KB910330)

This download contains a DPM 2006 hotfix that modifies the formulas that DPM 2006 uses to allocate space for shadow copy storage on the DPM 2006 server.

DPM 2006 Hotfix: Stored Shadow Copies are Overwritten (KB910330)