Backing up a user's PVC on GCP

What do folks use to backup a user’s PVC? To a Google storage engine bucket would be fine. I’m needing to experiment with blowing away some user clusters and want to backup and restore user pvc’s…

These are created in the canonical way from the 02jh helm script…

Not even sure how i would construct the name of the PV’s. Am i right in understanding is i mothball a cluster by helm delete it takes thse away. How could I keep them unattached as GCE disks…and is that what i should do.

Or should I be using some Kubernetes based backup service to get the user data of them so I can store it somewhere? What do people do for this? I looked to see discussion on this but am not finding much…