How do I connect to and back up to a hard drive on another Mac?

I have a 1.5 TB external hard drive connected to my iMac. I have it divided into 2 750 GB partitions. I am backing up my iMac to on partition and would like to back my Macbook Pro up to the other 750. How can I do this wirelessly? Thanks.

On the destination, set up Sharing -> File Sharing
On the source, connect to the destination and to the specific external drive using Finder.
Go to Time Machine Preferences and select the external drive as the TM drive
Add that external drive in System Preferences -> Accounts -> Login Items  (drag the connected drive from the desktop to the Login Items list).

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    Moderator, forums.bombich.com

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