My adsl usage shot up to ridiculous  levels for no apparent reason.

My adsl usage shot up to ridiculous  levels for no apparent reason.  More than a gig per day without me using my mac.  I have disconnected the mac from the router and the adsl usage stops.  Help! (mac mini mountain lion)

Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the page that opens.
Drag or copy — do not type — the following line into the Terminal window, then press return:
sudo lsof -i
You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning not to screw up. You don't need to post the warning. If you don’t have a login password, you’ll need to set one before you can run the command.
The output of the command shows what processes are accessing the network. That may help you to solve the mystery.

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