Lion AFP Time Machine Backups

Question

I have a MacBook Pro & a Mac Pro, both have fresh installs of Lion. I've also set up the Mac Pro as a Lion Server. I've set up a few AFP shares on the Mac Pro & I notice there's no "Time Machine Destination" option on the shares. I know this option was there on Snow Leopard. When I connect to the shares on the MacBook Pro, they do not show up as backup disks in the Time Machine preference pane. Is it possible to do this anymore?