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I have 1 iMac with external time machine drive and 1 macbook air.

My iMac's external time machine drive is active and I know 1 disk can be use for multiple mac's backup.

I want to backup my macbook air datas same external drive over on my iMac with wireless connection.

Can I do that?

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You can upgrade the operating system on your iMac to OSX Server.

Then your iMac "can act as a designated Time Machine backup location for all the Mac computers on your network."

Check out

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Thanks for the reply bob, but i don't want to use OSX Server. i just want to share my time machine disk and backup my other mac's disk. – Sam Aug 1 '13 at 18:13

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