From MSExchange.org:
Configuring Microsoft Exchange for Fast Recovery is a free e-book available from Realtime Publishers.
Microsoft Exchange is the premiere authority for email in today’s global marketplace. With the impact email has on the workplace and corporate communications, along with the advent of Exchange Server 2007, maintaining an optimal environment is vital. This includes building a resilient environment that can recover from unexpected interruptions.
The Essentials Series: Configuring Microsoft Exchange for Fast Recovery will provide you with the tools for configuring hardware backup and restoration strategies to help return Exchange to full function with minimal downtime.
The download is available here at the Realtime Publishers website. There are other free ebooks available as well, but be warned you need to jump through some registration and personal information hoops to get access to them.
need for e book for exchange