How do I make a backup of a Kubernetes cluster?

Followed multiple guides and tried K10, Stash, and Velero, but none of them back up elasticsearch or redis volumes.

'Snapshot resources are not supported,' said K10.

Valero: S3 backup indicated 43 things were backed up, so I went to S3 and unpacked the files, but they were empty.

Any assistance in locating a backup solution would be highly appreciated.