[Unit]
Description="Script a para copias de seguridad en el apagado"
After=network.target network-online.target
Wants=network-online.target
Before=shutdown.target

[Service]
Type=oneshot
RemainAfterExit=true
ExecStart=/bin/true
#Copiaremos antes de apagar
ExecStop=/home/jefe/curso/tar_back.sh

[Install]
WantedBy=multi-user.target