How to take etcd backup

etcdctl snapshot save command is not working?
giving snapshot topic not found…should not relay on kodekloud…i just gave exam cka
kubeadm upgrade apply command also not working there, and etcdctl snapshot didn’t work…in cka lightning lab they changed etcd question…that one also not working, they didn’t even given update , that etcd has changed something like that…feel like should beat mumshad…i wnt recommend this to anyone for sure