Once you delete it, it's gone. You can't recover it unless you backed it up.

There are a couple of popular tools to backup your cluster:

• Ark
• kube-backup

If you have a stateful applications Ark is a better solution, since it handles things like persistent volumes. If you have stateless applications kube-backup is good enough since it basically backups all your Kubernetes cluster resources.

If you have stateful applications, i.e databases, it may also vary on a case by case basis, for example you'd backup a MySQL database with mysqldump.