Using Time Machine to Back up onto a NAS Server

It is easy to add NAS Devices as backup Devices for Timemachine:

Start the terminal app on the mac where You want to use Timemachine
Enter the following in Terminal: defaults write com.apple.systempreferences TMShowUnsupportedNetworkVolumes 1

After that You will see all possible networkshares in Timemachine (and You can also use them).