Help me track down bandwidth thief

For the past month or so one server of mine has been transferring approx. 15Gb of (outgoing) bandwidth per day without any account on the server (cpanel box) being credited for it...

The server suddenly went from consuming 2-3Gb of outgoing bandwidth per day to 20Gb...

If anyone has any tips on how to track down who's stealing all this bandwidth and how please do tell ..

No one has shell access to the server but me ..

 

 

 

 

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