Stop OpenNMS Horizon service sudo systemctl stop opennms Back up OpenNMS Horizon binaries, RRD archives, configurations sudo tar --exclude='/opt/opennms/data/cache' -cvzf /tmp/opennms-opt.tar.gz /opt/opennms && \ sudo tar -cvzf /tmp/opennms-var.tar.gz /var/opennms Create PostgreSQL database backup sudo runuser -l postgres -c 'pg_dumpall -f /tmp/opennms-postgres.dmp' Back up OpenNMS Horizon operating system user sudo grep opennms /etc/passwd > /tmp/opennms-passwd.txt && \ sudo grep opennms /etc/group > /tmp/opennms-group.txt