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I've been using an external hard drive on my MacBook for time machine for a year or so. Now I have a Mac Mini too and have connected the external hard drive to that for the same purpose.

I want to leave it connected to my Mac Mini and still backup to it wirelessly from my laptop.

I have done all the steps to allow time machine to recognise network drives and I can see the drive from my laptop etc., but it won't recognise the old backups.

Do I need to change the file permissions or similar to get it working?

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Just Just go into System PreferencesTime Machine and hit Select Disk…

(If that's not working, let us know what error you're getting/what does happen.)

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More info at – Matthew Elvey Oct 18 '13 at 19:05

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