Ulrich Krause presented on the DAOS (Domino Attachment and Object Service) at AdminCamp 2009, highlighting its functionality in optimizing storage by offloading attachments from databases to an external file system. The presentation covered techniques for reducing database size, utilizing note and document body compression, and the setup of DAOS within Domino 8.5. It emphasized the requirements for implementation and the benefits of improved performance and reduced redundancy in data storage.