With OCPBUGS-18274 we had to update the etcdctl binary. Unfortunately the script does not attempt to update the binary if it's found in the path already:

https://github.com/openshift/cluster-etcd-operator/blob/master/bindata/etcd/etcd-common-tools#L16-L24

This causes confusion as the binary might not be the latest that we're shipping with etcd.

Pulling the binary shouldn't be a big deal, etcd is running locally anyway and the local image should be cached already just fine. We should always replace the binary

any currently supported release

always

1. run cluster-backup.sh to download the binary
2. update the etcd image (take a different version or so)
3. run cluster-backup.sh again 

cluster-backup.sh will simply print "etcdctl is already installed"

etcdctl should always be pulled