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Helpful answers
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Dec 8, 2015 5:46 PM in response to Robert York1by Bob Timmons,What you are trying to do is not officially supported by Apple, so there is not going to be a reliable "fix" for your issue.
All that you can really try to do is mount the backup drive on your MacBook Air using the Finder when you first start up the MacBook Air. Then, open Time Machine Preferences to confirm that the application can "see" the drive as a backup target for Time Machine.
You may need to restart the MacBook Air frequently, as well as the Mac Mini.
Life would probably be a lot easier if you had an AirPort Extreme and then connected the drive to the USB port on the Extreme. That way, it will "show up" by default as a backup target for Time Machine.
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Dec 8, 2015 5:56 PM in response to Robert York1by Linc Davis,Please launch Keychain Access and inspect the item of type "Time Machine Password" corresponding to the server. The Account field must exactly match the short name of the user on the server who owns the shared folder containing the backup image. The matching is case-sensitive. Note that every user has both a long and a short name, and they are generally different. For example, the long name might be "Fubar" and the short name "fubar". Those names do not match, and only the short name is correct. Even if you can mount the share in the Finder using the long name, it will not be mounted automatically by Time Machine.
To be safe, neither the user name nor the password should contain any non-alphanumeric characters. Use only plain letters of the alphabet and digits.
Credit for this observation to ASC member Roger Jolly.
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