I had the same problem as Kevinc247 with a 180GB SSD rapidly running out of capacity after installing Plex. So I wanted to move the offending Plex files from the SSD to a conventional hard drive. I hope the following comments will be useful. They are applicable to Windows 7, but I’m sure it applies in principle to other Systems
Firstly, by default, Plex stores its support data in the following location
C:\Users\Name\AppData\Local\
in a folder called “Plex Media Server”
This is defined (and definable) in
Plex Server Settings / Server / General
To move the Plex AppData from its default location to another drive,
First check the default location by noting the location defined in the Server settings defined above
Second, copy (not move) the entire folder “Plex Media Server” to the desired new location, say on D Drive, at say D:\Plex Media Server
Third, change the defined default location in Server settings to D:\
Note that the new location should be defined as D:\ not D:\Plex Media Server. Otherwise Plex will create a new folder, Plex Media Server, inside the Plex Media Server folder, and will ignore all the data you have copied.
Exit Plex and restart it.
All the old libraries should be now accessible from the new location, and once you are satisfied that all is well you can delete the Plex Media Server folder from the old C Drive location.
A few points
The location of the Plex AppData has to be typed into the settings, rather than be browsed for, using a drop down menu. If the location is mistyped, this gives rise to the dreaded “Plex server settings are unavailable” and it leads to a catch-22 situation where you cannot correct the mis-typing because you can’t access it. In this case, you have to resort to a regedit solution. First create a restore point (very important), then open regedit, and go to
Computer/HKey_Current_User/Software/Plex,Inc./Plex Media Server and correct any misprint in “LocalAppDataPath”
On another topic, the app “Folder Size” is a great little app to quickly find bloat on your system SSD when you are inexplicably running out of disc space. Highly recommended.
Hope this is useful to someone!