Published up on Microsoft Download, we now have some official word on backup and restore for Lync Server. Quoted from DrRez:
This document describes a methodology for backing up and restoring the data that is required for full recovery of Microsoft Lync Server 2010 services. It includes the procedures for backing up data and recovering from the following levels of failure: Standard Edition Server, Central Management Server, Enterprise Edition Back End Server, a server that is a member of any Lync Server pool, a Lync Server pool, a File Store, an Archiving Server or a Monitoring Server with a collocated database, and a stand-alone Archiving database or Monitoring database.
Visit Backing Up and Restoring Lync Server 2010 to download the whitepaper.