computer-playbook/roles/backup-data-to-usb/templates/backup-data-to-usb.service.j2

[Unit]
Description=Backup to USB when mounted to {{ backup_to_usb_mount }}
Wants={{systemctl_mount_service_name}}
OnFailure=systemd-notifier.cymais@%n.service

[Service]
Type=oneshot
ExecStart=/bin/python {{ backup_to_usb_script_path }} {{backup_to_usb_source}} {{backup_to_usb_destination}}
ExecStartPost=/bin/systemctl start cleanup-backups.cymais.service

[Install]
WantedBy=multi-user.target