$ etcdctl make mirror --help
NAME:
make-mirror - Makes a mirror at the destination etcd cluster
USAGE:
etcdctl make-mirror [options] <destination> [flags]
OPTIONS:
--dest-cacert="" Verify certificates of TLS enabled secure servers using this CA bundle
--dest-cert="" Identify secure client using this TLS certificate file for the destination cluster
--dest-insecure-transport[=true] Disable transport security for client connections
--dest-key="" Identify secure client using this TLS key file
--dest-prefix="" destination prefix to mirror a prefix to a different prefix in the destination cluster
-h, --help[=false] help for make-mirror
--no-dest-prefix[=false] mirror key-values to the root of the destination cluster
--prefix="" Key-value prefix to mirror