Nothing bugs me more than to read a book in which the author talks about a really neat program, only to find out that the program is so full of bugs it won’t work. Most of the programs in this book are already running at hundreds of sites around the world. With all the typical “unsupported” disclaimers in place, I do my best to ensure that they continue to work for the people who use them. If you’re interested in any of the programs in the book (and on the CD), make sure that you subscribe to the appropriate mailing list on http://www.backupcentral.com. I will provide updates as they become available. (CD content is available online at http://examples.oreilly.com/unixbr.)