Alright, here’s what you need to do:
#1: Log into your NAS using ssh.
#2: Delete existing metadata from actual folder
rm -r /mnt/HD/HD_a2/Nas_Prog/plex_conf/Plex\ Media\ Server/*
#3: Log out of your NAS using exit.
#4: Copy the desired metadata using rsync:
rsync -avzP --exclude=.DS_Store ~/Library/Application\ Support/Plex\ Media\ Server/ 'sshd@10.36.62.243:/mnt/HD/HD_a2/Nas_Prog/plex_conf/Plex\ Media\ Server/'
#5: Log into your NAS using ssh.
#6: Make sure the correct user and group own the files:
chown -R root:root /mnt/HD/HD_a2/Nas_Prog/plex_conf/Plex\ Media\ Server/
#7: Repeat remaining steps from guide.