Simple k8s backup if you don't yet have k8up or velero in place. Use with caution. Extend extracted values as needed.

simple-k8s-backup.sh

#!/bin/bash

set -o pipefail -o errexit -o nounset -o errtrace

mkdir -p backup/

for ns in $(kubectl get ns --no-headers -o jsonpath='{range .items[*]}{.metadata.name}{"\n"}{end}'); do
  kubectl --namespace="${ns}" get -o=yaml role,rolebinding,secret,configmap | \
yq eval '
    del(
        .items.[].spec.clusterIP,
        .items.[].metadata.uid,
        .items.[].metadata.selfLink,
        .items.[].metadata.resourceVersion,
        .items.[].metadata.creationTimestamp,
        .items.[].metadata.generation,
        .items.[].metadata.managedFields,
        .items.[].status,
        .items.[].spec.template.spec.securityContext,
        .items.[].spec.template.spec.dnsPolicy,
        .items.[].spec.template.spec.terminationGracePeriodSeconds,
        .items.[].spec.template.spec.restartPolicy
    )' - > "./backup/${ns}.yaml"
done