Creates a backup Data Extension in SFMC

copyDE.js

<script runat=server>
Platform.Load("core", "1");

// create DE
var timeStamp = Math.round((new Date()).getTime() / 1000);

var deKey = "BACKUP_" + timeStamp;
var deName = "Backup DE " + timeStamp;

var obj = {
    CustomerKey : deKey,
    Name : deName,       
    Fields : [
        { "Name" : "SubscriberKey", "FieldType" : "Text", "IsPrimaryKey" : true, "MaxLength" : 50, "IsRequired" : true },
        { "Name" : "FirstName", "FieldType" : "Text", "MaxLength" : 50 },
        { "Name" : "LastName", "FieldType" : "Text", "MaxLength" : 50 },
        { "Name" : "EmailAddress", "FieldType" : "EmailAddress", "IsRequired" : true }
    ],
    SendableInfo : {
        Field : { "Name" : "SubscriberKey", "FieldType" : "Text" },
        RelatesOn : "Subscriber Key"
    }
};

var de = DataExtension.Add(obj);

// retrieve DE records

var sourceDE = DataExtension.Init("MASTER_CUSTOMERS");
var data = sourceDE.Rows.Retrieve();

// add source rows to target DE

var targetDE = DataExtension.Init(deKey);
targetDE.Rows.Add(data);

</script>