Yes.
I recently was forced to remake my Plex server because of an issue getting the jail itself to update properly. So I made a brand new jail, set up my mount points exactly the same as the old one, installed Plex to it, and then navigated to /mnt/jaildrive/iocage/jails/oldplexjail/root/usr/local/ and I made a TAR archive out of the plexdata-plexpass folder. I moved the plexdata-plexpass.tar file to the same location in the new jail, and expanded it to a folder of the same name. The result is I have now copied all the server info to the new jail. This is mostly covered in the Plex document on moving a server:
https://support.plex.tv/articles/201370363-move-an-install-to-another-system/
