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I use Time Machine to backup my OSX Mountain Lion computer. Recently I moved the "/Users" folder to a separate partition and used fstab to mount it back to "/Users". That all works fine.

But Time Machine won't see "/Users" as the original one. It sees it as a new drive and want to backup it so, resulting in a full backup of the "/Users" folder.

I've tried to alter the backup folder. Creating a hardline from the old Users folder to reflect the new Users.

Like so: "/Macintosh HD/Users" to "/Users"

But that didn't work, even using the command "tmutil associatedisk". That will result in "Not a snapshot volume."

How can I reconnect the "/Users" folder and make Time Machine backup correctly?

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I don't think you can. TM organizes itself by volumes, every different source volume is stored separately in on the backup disk. You also can't have hard links between volumes. –  Barmar May 13 '14 at 20:22

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