How to calc approximate cost for using Argo?

Hello,
How I can approximate cost for using Argo ? In my server statics I see 50Gb traffic per day. But Cloudflare show

     Total Bandwidth

    <small>Last 24 hours</small>

    2.22 TB

Why is there such a big difference?

Problem fixed. I’ve few download server. When CloudFlare move DNS records from my registrator, set Proxied for downloads server too.