Incoming traffic usage far more than Outgoing traffic

I've been having an issue on my co-located server for sometime now but here recently it's becoming a very pricey issue. My Outgoing traffic usage is very very large, far more than my Outgoing traffic. Take for example just last month:

Outgoing: 742GB
Incoming: 1,400GB (1.40TB)

I've checked with my datacenter and they assure me my stats are correct and that incoming is in fact incoming and outgoing is in fact outgoing - nothing is crisscrossed. I've also checked bandwidth usage in WHM per domain and as a whole server and it very closely matches the Outgoing traffic being recorded by my datacenter.

While Google Analytics doesn't show bandwidth usage the other stats such as visitors, page views, etc are all very close to that found in my cPanel AWStats when comparing to 2 domains hosted on my server. So I know at least some of the stats show in WHM/cPanel do seem to be correct.

At any rate, what I'd like to figure out is what in the world is using 1.4TB of bandwidth coming INTO my server?!? I host about a dozen small sites for friends and family, none of which are any kind of file uploading services etc.

Can anyone give me any suggestions be it something I can do myself, software, or 2nd party that can help me pinpoint what in the world is eating up all this incoming traffic?

Any help at all would be GREATLY appreciated!

Thanks!

 

WHM > View Bandwidth Usage -- only shows OUTgoing bandwidth usage, not INcoming. The bandwidth usage on that page matches that shown on my datacenters Outgoing usage.

What I'm trying to figure out is where all the INcoming bandwidth is being used for, or more so why is it so incredibly high.

 

Anyone else?