There were 480 companies in the World Trade Center in NYC. Only 230 companies had a disaster recovery plan in place. 100 companies probably did not need one due to their small size. Which leaves 160 companies that did not have a plan in place and as a result they will not be around a year from now! This book explains to system administrators and architects what they need to know to plan for and get through disaster recovery. It incorporates the latest technologies in data storage, networks, server systems, and the Internet (Web-based recovery planning and crisis management) and shows how they can become components of a corporate survival strategy for future disasters. This third edition is completely revised and updated to reflect new information on data storage topologies, challenges for recovery, problem of data re-hosting as well as coverage of latest technologies and trends. The book also covers the lessons learned from WTC disaster and includes references to the California power outages, new mailroom procedures--due to anthrax scares--and new physical access controls that enable you to know where everyone is in a building by tagging them with an electronic badge.