Why do simple bandwidth alarms miss data theft?

Because they ask the wrong question. A bandwidth alarm asks whether a link is busier than a fixed limit; data theft is usually designed to stay under it. Attackers send in chunks, at night or during busy hours when a few hundred megabytes vanish among backups and video calls, and to cloud storage services your staff also use, so destination lists do not flag them either. A fixed limit also fires on every large legitimate transfer, so people stop reading the alarms. The useful question is per host: is this machine sending more, to a different destination, or at a different time than it normally does? That needs a baseline per host rather than per link. NetSenX keeps such a baseline and flags unusual outbound data volume per host on every plan, Free included.

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