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Is there any way to (manually or automatically) share downloaded software updates between macs?

Edit: The thinking is that I have one mac update itself using Software Update, and then somehow share the downloaded updates with other macs.

For example, I have a mac pro and a mac mini on my local network. I'd like to download the Mac OS X 10.6.5 update only once, instead of having to download it separately for each mac.

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Yes if you download the sofware update manually not using Software update from Apple e.g. list of support downloads As Apple says

You can manually download the update installer. This is a useful option when you need to update multiple computers but only want to download the update once. These versions of the standalone installers are available from Apple Support Downloads.

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Manually? Just download it once.

Automatically? You run Mac, not Windows. It doesn't have features like WSUS.

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Actually, OS X has a feature a lot like WSUS -- It's called the Software Update service, and (like WSUS) requires a server to download updates and provide them locally to clients (and/or other servers). – Gordon Davisson Nov 13 '10 at 17:12
Not all Macs use the same Delta updaters, you'll have to manually donwload the Combo updates and then share those with the rest of your Macs. – Madison S Nov 13 '10 at 17:46

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