OpenEBS Full Installation with 2 minio app deployed.
1 mino app i.e minio-1-deployment-745dcdc8bd-mc9qs on CSI volume(cspc v1 based) and other i.e. minio-deployment-77bddd4df4-kttfn on NON CSI volume(spc based)

k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get pod
NAME                                  READY   STATUS    RESTARTS   AGE
minio-1-deployment-745dcdc8bd-mc9qs   1/1     Running   0          6m31s
minio-deployment-77bddd4df4-kttfn     1/1     Running   0          43m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get pvc
NAME               STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS        AGE
minio-1-pv-claim   Bound    pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b   10Gi       RWO            openebs-csi-cstor   6m38s
minio-pv-claim     Bound    pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6   10G        RWO            openebs-cstor-spc   43m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                      STORAGECLASS        REASON   AGE
pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b   10Gi       RWO            Delete           Bound    default/minio-1-pv-claim   openebs-csi-cstor            6m40s
pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6   10G        RWO            Delete           Bound    default/minio-pv-claim     openebs-cstor-spc            43m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get spc
NAME        AGE
cstor-spc   47m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get csp
NAME             ALLOCATED   FREE    CAPACITY   STATUS    READONLY   TYPE       AGE
cstor-spc-27up   664K        19.9G   19.9G      Healthy   false      mirrored   47m
cstor-spc-3d9r   586K        19.9G   19.9G      Healthy   false      mirrored   47m
cstor-spc-mb6u   576K        19.9G   19.9G      Healthy   false      mirrored   47m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get cvr.openebs.io -n openebs
NAME                                                      USED    ALLOCATED   STATUS    AGE
pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6-cstor-spc-27up   8.59M   220K        Healthy   43m
pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6-cstor-spc-3d9r   8.59M   220K        Healthy   43m
pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6-cstor-spc-mb6u   8.59M   220K        Healthy   43m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get cspc -n openebs
NAME          HEALTHYINSTANCES   PROVISIONEDINSTANCES   DESIREDINSTANCES   AGE
cspc-mirror   3                  3                      3                  17m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get cspi -n openebs
NAME               HOSTNAME           ALLOCATED   FREE     CAPACITY    READONLY   TYPE     STATUS   AGE
cspc-mirror-2fq2   worker3-ashutosh   314k        19300M   19300314k   false      mirror   ONLINE   17m
cspc-mirror-74zb   worker2-ashutosh   1930k       19300M   19301930k   false      mirror   ONLINE   17m
cspc-mirror-qz9k   worker1-ashutosh   309k        19300M   19300309k   false      mirror   ONLINE   17m
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get cvr.cstor.openebs.io -n openebs
NAME                                                        USED    ALLOCATED   STATUS    AGE
pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b-cspc-mirror-2fq2   7.86M   148K        Healthy   7m27s
pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b-cspc-mirror-74zb   7.86M   147K        Healthy   7m27s
pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b-cspc-mirror-qz9k   7.86M   147K        Healthy   7m27s
k8s@master1-ashutosh:~/cstor-operators/minio$ kubectl get pod -n openebs
NAME                                                              READY   STATUS    RESTARTS   AGE
cspc-mirror-2fq2-6fc877d465-rkqn2                                 3/3     Running   0          18m
cspc-mirror-74zb-b9cf84fb4-k84k4                                  3/3     Running   0          18m
cspc-mirror-qz9k-7467b58679-lccm4                                 3/3     Running   0          18m
cspc-operator-8c47ff9c6-kcghg                                     1/1     Running   0          45m
cstor-spc-27up-77c7cd556-24j4s                                    3/3     Running   0          48m
cstor-spc-3d9r-56477466d9-9zrnl                                   3/3     Running   0          48m
cstor-spc-mb6u-5677d9b8d-4knpm                                    3/3     Running   0          48m
cvc-operator-6ddd6fcdbb-nzsks                                     1/1     Running   0          45m
maya-apiserver-5d5b7cd4c6-8ql2m                                   1/1     Running   0          56m
openebs-admission-server-79d67c69db-99rnr                         1/1     Running   0          56m
openebs-cstor-admission-server-6755dd887c-9tgfg                   1/1     Running   0          45m
openebs-localpv-provisioner-8649f446cf-nh257                      1/1     Running   0          56m
openebs-ndm-h9b7f                                                 1/1     Running   0          56m
openebs-ndm-m4zd2                                                 1/1     Running   0          56m
openebs-ndm-operator-69957b7869-8c52b                             1/1     Running   0          56m
openebs-ndm-srgwq                                                 1/1     Running   0          56m
openebs-provisioner-b8bc47dd-tmj28                                1/1     Running   0          56m
openebs-snapshot-operator-6f4f7455f5-5qbrs                        2/2     Running   0          56m
pvc-5c06d85e-7da9-4048-b7e0-6fbdf883e05b-target-75bb95754dzdslb   3/3     Running   1          7m37s
pvc-b35aabf1-f1b2-4ace-8f8f-fdbb41a2a1c6-target-649dc5c6b-dsh52   3/3     Running   0          44m 

BackUp/Restore

Step 1 : Backup using velero backup command
($: velero backup create harmonybackup --include-namespaces=default --snapshot-volumes --volume-snapshot-locations=default)

$: velero backup describe harmonybackup
Name:         harmonybackup
Namespace:    velero
Labels:       velero.io/storage-location=default
Annotations:  velero.io/source-cluster-k8s-gitversion=v1.18.0
              velero.io/source-cluster-k8s-major-version=1
              velero.io/source-cluster-k8s-minor-version=18

Phase:  Completed

Namespaces:
  Included:  default
  Excluded:  <none>

Resources:
  Included:        *
  Excluded:        <none>
  Cluster-scoped:  auto

Label selector:  <none>

Storage Location:  default

Velero-Native Snapshot PVs:  true

TTL:  720h0m0s

Hooks:  <none>

Backup Format Version:  1

Started:    2020-06-11 19:23:23 +0530 IST
Completed:  2020-06-11 19:23:57 +0530 IST

Expiration:  2020-07-11 19:23:23 +0530 IST

Total items to be backed up:  142
Items backed up:              142

Velero-Native Snapshots:  2 of 2 snapshots completed successfully (specify --details for more information)

Step 2 : Deleted both minio application with thier volumes.

Step 3: Restore Using velero restore command
($:velero restore create --from-backup harmonybackup --restore-volumes=true)

$ velero restore describe harmonybackup-20200611192544

Name:         harmonybackup-20200611192544
Namespace:    velero
Labels:       <none>
Annotations:  <none>

Phase:  Completed

Warnings:
  Velero:     <none>
  Cluster:  persistentvolumes "pvc-6713ac1c-3419-43df-ae5f-bdf270636d16" not found
            persistentvolumes "pvc-9b7ddf35-b8c2-4673-8918-9fc284152886" not found
  Namespaces:
    default:  could not restore, persistentvolumeclaims "minio-1-pv-claim" already exists. Warning: the in-cluster version is different than the backed-up version.
              could not restore, persistentvolumeclaims "minio-pv-claim" already exists. Warning: the in-cluster version is different than the backed-up version.
              could not restore, services "kubernetes" already exists. Warning: the in-cluster version is different than the backed-up version.

Backup:  harmonybackup

Namespaces:
  Included:  all namespaces found in the backup
  Excluded:  <none>

Resources:
  Included:        *
  Excluded:        nodes, events, events.events.k8s.io, backups.velero.io, restores.velero.io, resticrepositories.velero.io
  Cluster-scoped:  auto

Namespace mappings:  <none>

Label selector:  <none>

Restore PVs:  true

Step 4 : Set the target IP
(How to do that ? Follow this link https://github.com/openebs/velero-plugin#creating-a-restore-for-remote-backup)

Voila! Both my minio application and their volumes came back and online.

k8s@master1-ashutosh:~$ kubectl get pod
NAME                                  READY   STATUS    RESTARTS   AGE
minio-1-deployment-745dcdc8bd-kp2zr   1/1     Running   0          17m
minio-deployment-77bddd4df4-xtqkj     1/1     Running   0          17m

k8s@master1-ashutosh:~$ kubectl get pvc
NAME               STATUS   VOLUME                                     CAPACITY   ACCESS MODES   STORAGECLASS        AGE
minio-1-pv-claim   Bound    pvc-e7990c7e-e1b5-41be-9444-9bb3a2f318bf   10Gi       RWO            openebs-csi-cstor   18m
minio-pv-claim     Bound    pvc-6d54583d-a222-47f3-a407-7494b27c6ace   10G        RWO            openebs-cstor-spc   18m

k8s@master1-ashutosh:~$ kubectl get pv
NAME                                       CAPACITY   ACCESS MODES   RECLAIM POLICY   STATUS   CLAIM                      STORAGECLASS        REASON   AGE
pvc-6d54583d-a222-47f3-a407-7494b27c6ace   10G        RWO            Delete           Bound    default/minio-pv-claim     openebs-cstor-spc            18m
pvc-e7990c7e-e1b5-41be-9444-9bb3a2f318bf   10Gi       RWO            Delete           Bound    default/minio-1-pv-claim   openebs-csi-cstor            18m

k8s@master1-ashutosh:~$ kubectl get cvr.openebs.io -n openebs
NAME                                                      USED    ALLOCATED   STATUS    AGE
pvc-6d54583d-a222-47f3-a407-7494b27c6ace-cstor-spc-5bfh   7.89M   188K        Healthy   18m
pvc-6d54583d-a222-47f3-a407-7494b27c6ace-cstor-spc-6dth   7.89M   188K        Healthy   18m
pvc-6d54583d-a222-47f3-a407-7494b27c6ace-cstor-spc-wz25   7.89M   188K        Healthy   18m

k8s@master1-ashutosh:~$ kubectl get cvr.cstor.openebs.io -n openebs
NAME                                                        USED    ALLOCATED   STATUS    AGE
pvc-e7990c7e-e1b5-41be-9444-9bb3a2f318bf-cspc-mirror-6mgc   6.72M   173K        Healthy   18m
pvc-e7990c7e-e1b5-41be-9444-9bb3a2f318bf-cspc-mirror-7xqq   6.83M   174K        Healthy   18m
pvc-e7990c7e-e1b5-41be-9444-9bb3a2f318bf-cspc-mirror-x6dh   7.05M   178K        Healthy   18m
k8s@master1-ashutosh:~$