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Helpful answers
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Aug 23, 2012 1:02 AM in response to adriaanfromwashingtonby mende1,Go to > About this Mac > More Info > Storage and check backups
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Aug 23, 2012 1:05 AM in response to adriaanfromwashingtonby Kivanc Muslu,13 GB seems exessive, however the only thing I can come up with for using data while idle is: power nap http://support.apple.com/kb/HT5394?viewlocale=en_US&locale=en_US
If you think that it might be the reason, try disabling it and look at data usage again. Hopefully this will at least eliminate one possibility. Do you have auto time machine (or capsule) backups? Power nap tries to back your computer whenever it is possible and also tries to check your e-mails, update your iCloud syncs, etc., which might use network data.
Edit: I guess I misunderstood the question. Mende1 is probably more accurate.