MAC BOOK AIR Unusual Data Consumption by Mountain Lion OS

Hi,
I am using MAC Book Air and my OS is upgarded to Mountain Lion. After upgradation I am facing a problem of data consumption by my MAC all the time from my wifi modem, even without opening any brpwser or Mail. Kindly provide solution for this proble. Please note that all the settings in icloud is off.
Regards,
Desikachary

this never happened to Windows unless you have a virus , So is this normal for a Mac ?
It certainly can be. Free RAM is wasted RAM. Inactive RAM is as good as free RAM (it can and will be freed immediately when needed), but can be used to speed up your machine by holding cached data. As an example, suppose you quit Mail. Perhaps it was accidental (command-W is right next to command-Q), or perhaps you forgot to look at something you meant to look at, but in any event, you re-open Mail. It should pop back open very quickly, because everything is still cached in RAM.
So, in other words, don't worry about it. Even if you were having a problem, the source would be elsewhere.

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