All my libraries disappeared

Plex Media Server Desktops & Laptops
6

  1. Shut down the server

  2. copy the whole Plex data folder from one user’s profile folder to the other.
    (or: copy it onto its own dedicated partition or hard drive. Details here: [HowTo] An extended guide on how to move the Plex data folder on Windows )

  3. Save the registry branch from one user and import the .reg file while logged into the other.
    https://support.plex.tv/articles/201539237-backing-up-plex-media-server-data/