Backup Setup Problem

  Piphel 14:20 24 Jan 10

I want to use Windows Backup to save my data on my Windows 7 machine via my home network to another (Vista) PC. Even though the other machine is fully visible for file sharing, printing, etc purposes I don't get the 'Save on a network..." button on the 'Set up backup' dialogue box.
I can see from screen shots within Windows help text where it should be, but can't work out what I've failed to do to enable it.
Have I missed something simple?

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