listen-urls specifies the local addresses etcd server binds to for accepting incoming connections. To listen on a port for all interfaces, specify 0.0.0.0 as the listen IP address.
advertise-urls specifies the addresses etcd clients or other etcd members should use to contact the etcd server. The advertise addresses must be reachable from the remote machines. Do not advertise addresses like localhost or 0.0.0.0 for a production setup since these addresses are unreachable from remote machines.
etcdctl provides a snapshot command to create backups. See backup for more details.