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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I've previously used vnstat for this, it can break it down for different time periods and stuff. Seems to also separate between devices, so if you're using a cable at home and wifi elsewhere you'd still get a good estimate of your home usage I guess.
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