constant 100k/s outgoing transfer on a near-empty server?

unitedcolo... constant 100k/s outgoing transfer on a near-empty server?

looking at the mrtg graphs, i'm getting constant 100k/s outgoing transfer, but the server is nearly empty! just a few html pages... and i don't think anyone visits the sites anyway. what could be using this bandwidth? tia

 

 

 

 

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