Re: Leopard...!
Eleanor Spenceley As far as I understand it the remote backup capability was pulled at the last minute. Here's hoping the feature will be re-introduced when 10.5.1 is released.
Here's a possible POTENTIALLY VERY DANGEROUS fix.
http://www.engadget.com/2007/11/10/how-to-enable-time-machine-on-unsupported-volumes/
And a possible explanation why it was pulled:
http://www.roughlydrafted.com/2007/11/08/why-leopards-time-machine-doesnt-support-airport-disks/
Martin