Thanks for your response.
I've found a technet article that describes the different options for backup/restore. But I still don't see if this should be working with DP, at least google did not find anything related.
Backup and Restore of Data Deduplication-Enabled Volumes
http://msdn.microsoft.com/en-us/library/hh769304%28v=vs.85%29.aspx
Optimized Backup:
In optimized backup, the backup application does the following:
- Uses a shadow copy of the optimized volume.
- Specifies the FILE_FLAG_OPEN_REPARSE_POINT flag when opening the data deduplication-optimized files.
- Copies the optimized files (reparse points) and chunk store container files as-is from the shadow copy to the backup store.