add the --data-dir option

practice-questions-answers/cluster-maintenance/backup-etcd/etcd-backup-and-restore.md

@@ -53,6 +53,11 @@ ETCDCTL_API=3 etcdctl  --data-dir /var/lib/etcd-from-backup \
 Note: In this case, we are restoring the snapshot to a different directory but in the same server where we took the backup (**the controlplane node)**
 As a result, the only required option for the restore command is the **--data-dir**.  
 # 4. Modify /etc/kubernetes/manifests/etcd.yaml
+Update --data-dir to use new target location
+
+```
+--data-dir=/var/lib/etcd-from-backup
+```
 
 Update ETCD POD to use the new hostPath directory `/var/lib/etcd-from-backup` by modifying the pod definition file at `/etc/kubernetes/manifests/etcd.yaml`. When this file is updated, the ETCD pod is automatically re-created as this is a static pod placed under the `/etc/kubernetes/manifests` directory.