So you have mixed program folder and data folder? Not the best of decisions, but I guess you can salvage them.
You’d need to edit the registry according to this [HowTo] An extended guide on how to move the Plex data folder on Windows
and use the path G:\Plex (or wherever you are copying this data).
You must do this while the plex server is not running (i.e. no Plex task tray icon visible)
But do keep the program files this time on C:
You need to copy the whole folder. Don’t try to be selective.
