Backup to external drive connected another mac?

Can you backup over the network to an external FW drive connected to another mac? I'm sure I've read that this is possible but not sure of the procedure. I can connect to the external drive over the network, it pops up on the desktop but Time Machine simply won't see it. Is there a trick to this? Thanks.

The other mac must be running Leopard, the drive must be properly formatted. If you are able to mount the other mac's volume to your mac, then you must have logged in correctly with the right account. Given all this, TM should then list the volume when choosing the destination drive in preferences.

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