<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <meta http-equiv="Pragma" content="no-cache" />
    <meta http-equiv="Expires" content="0" />

+

    Cache-Control: no-cache, no-store, must-revalidate
    Pragma: no-cache
    Expires: 0

+

    User-agent: ia_archiver
    Disallow: /

Of course, this won't prevent crawlers which do not honor these headers/meta tags from caching your site, but if you're not in Google's index you're likely not getting traffic from said crawlers.