Quick Tip: How to setup Time Machine to backup to NAS storage
February 6th, 2010
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I was trying to setup Time Machine on my MacBook to create backup on network storage. It seems that by default it is impossible to do it, if you don’t have Time Capsule.
There is a handy command though that gives you permissions to see all types of storage in Time Machine setup.
defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1
I am able to see my Network Storage in Time Machine now 
Greg