etcd backup restore using persistent volume as local storage

[veenabenoy]

I am new user to etcd . I want to enable etcd data back up using a local storage (in the local system path like var/etcd/lib/data/data_bkp and restore from the specified back up data path. Could any one please guide me how do I do the etcd cluster configuration supporting local storage path in a yaml file . I am planning to install etcd using helm:
helm install --name my-etcd --pv-provisioner=none --values values.yaml stable/etcd-operator.

I have seen examples using S3, cloud persistent volume etc. but couldn't find a solid example to specify local storage path for both back up and restore as a configuration.