load-balanced.dot

digraph G {
    customers -> LB -> web1;
    LB -> web2;
    LB -> web3;
    LB -> web4;
    web1 -> DB1;
    web2 -> DB1;
    web3 -> DB1;
    web4 -> DB1;
    DB1 -> DB2;
    DB2 -> backups;
    web1 -> backups;
    DB1 [label="DB Master"];
    DB2 [label="DB Slave"];
    backups [label="Cloud Backups"];
    LB [label="Load Balancer"];
}