ETCD backup restore question

Kubernetes
#1

Hello,

In all the videos I watched the restore is done via a similar command:

ETCDCTL_API=3 etcdctl --endpoints=https://[127.0.0.1]:2379 --cacert=/etc/kubernetes/pki/etcd/ca.crt \
     --name=master \
     --cert=/etc/kubernetes/pki/etcd/server.crt --key=/etc/kubernetes/pki/etcd/server.key \
     --data-dir /var/lib/etcd-from-backup \
     --initial-cluster=master=https://127.0.0.1:2380 \
     --initial-cluster-token etcd-cluster-1 \
     --initial-advertise-peer-urls=https://127.0.0.1:2380 \ 
     snapshot restore /tmp/snapshot-pre-boot.db

But when I look at the k8s guide, the command listed is much simpler (no matter if using the deprecated etcdctl or etcdutl):

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Which is the correct way?
I used the shortest version in one or two exercise and the backup was restored with no issue. I also did not have to modify the etcd configuration to point to the new etc folder.
I am a bit confused, so thanks in advance for the clarification.

#2

You only need all those arguments if you are restoring a multi-node etcd cluster, which you won’t be in an exam.

The simple version of the command is enough
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