Any time a device is powered on that has access to your home network, it is capable of consuming data regardless of whether you are actively using it or not unless it's in a sleep state (with no auto wake settings up enabled) or full hibernation state - you don't even have to be logged into the operating system with username and password for that to occur. For example, under Windows (maybe others) it requires knowing the subtle differences between being logged off, sleeping and hibernating and how power is configured. sleep can sometimes be a tricky one since there are some events that can cause the operating system to awaken dependent on configuration - a a real life example, the dog pictured at left has been known to awaken my computer from its sleep with a simple brush of his tail on the mouse or keyboard (he's taller than most). In that case, the dog did in fact eat my data - but I've since corrected it so that he'd have to press the power button.
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