The most common answer to any question that involves network backup: http://www.amanda.org/
I still prefer Microlite Edge - yes, I am a reseller, but I'm a reseller because I like the product, not vice-versa.
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Inexpensive and informative Apple related e-books:
iOS 10: A Take Control Crash Course
Take Control of Apple Mail, Third Edition
Are Your Bits Flipped?
Take control of Apple TV, Second Edition
Take Control of the Mac Command Line with Terminal, Second Edition