[Unit]
Description=Backup files to PVE Backup server
After=network.target network-online.target

[Service]
Type=oneshot
EnvironmentFile=-/etc/sysconfig/pve-backup-script
ExecStart=/usr/bin/proxmox-backup-client backup <backup name>.pxar:/<backuping dir>/ --ns <namespace> --change-detection-mode=metadata

[Install]
WantedBy=multi-user.target