Is safe import a kubernetes cluster?

I want to import a Kubernetes cluster that is already in production and has sensitive applications running. This cluster uses microk8s. I would like to know if there is a list of requirements that I need to check first and if it is safe to import using rancher.

How does Rancher handle the import of clusters with sensitive applications? Are there any security protocols or measures you need to follow to ensure the integrity and confidentiality of your data?