plex backup

Regarding making a backup of your PMS metadata, in Linux, the simplest and perfect backup you can make is

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sudo sh
cd /var/lib/plexmediaserver
tar cf /where/to/save/backup/Library.tar   ./Library
When complete, Library.tar will have the full backup image of your files.

Should you later need to restore it., you only need to stop PMS and do the following

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sudo sh
cd /var/lib/plexmediaserver
rm -rf Library     # remove anything which pre-exists
tar xf /path/to/saved/Librar.tar
chown -R plex:plex ./Library
Then start PMS.