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To be able to back up a k8s cluster, first we need the executable file etcdctl, downloadable from here (choose the appropriate release). Also in the compressed file are two other executables, etcd and etcdutl, which may come in handy in the future. After that, unpack the archive file (this results in a directory containing the binaries) and add the executable binaries to your path (i.e. /usr/local/bin)

# For example, let's download release 3.5.4
$ wget https://github.com/etcd-io/etcd/releases/download/v3.5.4/etcd-v3.5.4-linux-amd64.tar.gz
$ tar xzvf etcd-v3.5.4-linux-amd64.tar.gz
# In addition to the etcdctl executable, we also take etcd and etcdutl
$ sudo cp etcd-v3.5.4-linux-amd64/etcdctletcd* /usr/local/bin/

$# etcdctl Check that everything is OK
$ etcdctl version
etcdctl version: 3.5.4
API version: 3.5
$ etcdutl version
etcdutl version: 3.5.4
API version: 3.5
$ etcd --version
etcd Version: 3.5.4
Git SHA: 08407ff76
Go Version: go1.16.15
Go OS/Arch: linux/amd64

Once we have the executable file, we need the certificates to be able to communicate with the etcd node(s). If you don't know the location of the certificates, you can retrieve it using the grep command in the /etc/kubernetes folder on the master node (the default directory that holds the certificates in the etcd node is /etc/ssl/etcd/ssl). Save the location of the certificates in the following environment variables

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