Bandwidth spike monitor?

Just wondering if there is any software or anything like that, that will alert you when your bandwidth spikes a great amount in a day or something.
I have a site with a model's webpage on it, and someone posed the password to the members section on a large forum. So thousands of people were coming in and downloading everything. So unless I check it every day, I wouldn't know.
I have a dedicated server now, and not too familar with having one, so..
Is there software or something that monitors your bandwidth and picks up large bandwidth spikes for things like that?
THank you.

 

 

 

 

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