Not sure why the Plex help docs are so cryptic here, it isn’t overly complicated. Pointing to a technical Wikipedia page about Symbolic Links - good one guys, that’s just super useful.
If anyone needs the short version of what to do on a Mac to move your preferences, this worked for me:
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Close down Plex.
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Create an empty folder called “Plex Media Server” on the drive where you want your meta data to exist going forward.
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Navigate to the current Plex location: “Library > Application Support > Plex Media Server”. If you don’t know how to do this…from any finder window, using the top menu bar on your Mac look for the “Go” option. Click the “Go” and press and hold the “shift” key and you’ll see the Library folder appear as an option.
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Have two finder windows open, the old Plex Media Server in one, the new in the other.
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Copy all of the files and folders from that old folder location to your new folder and then delete the old one.
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Open your Terminal application and create your symbolic link (basically just a special type of shortcut file). Type in the following (without quotes): "ln -s " followed by the path to where the new “Plex Media Server” folder is, followed by the path to the parent folder that contained the old “Plex Media Server” folder and then hit return.
That’s it. Your done. Restart Plex and you should be good to go (at least I was anyway).
For those not familiar with folder paths and how to access them on a Mac, a common tip is to just drag a folder directly into the Terminal app window and it will write out the path for you wherever the cursor is - so in the above case you end up dragging and dropping the new folder first, the parent folder of the old one second. Here’s a little video to show you if you aren’t sure what I’m talking about:
Hope that helps.