You can change the volume PMS is stored on in Control Panel - Shared Folder
(This works for ANY shared folder)
- With Plex stopped-
- Control Panel → Shared Folder
- Highlight the “PlexMediaServer” shared folder
- Click “EDIT”
- You will see which volume it’s currently stored on.
- Click the dropdown and change the volume.
- Click “SAVE”
- Wait for DSM to finish moving the data.
To get Plex back will take some more work.
COPYING the backup on top of the system is what breaks it.
All the files aren’t owned by PlexMediaServer anymore and need to be fixed.
Read through this. It’ll show you what you need to do to fix the PlexMediaServer shared folder.