You can configure Ecowitt.net upload to 1, 2, 3, 4, or 5 minutes. I have mine set to 1 minute and it works very nice. But this is only for the online live dashboard. Historical data is stored in 5 minute increments for graphs and data charts. No idea on how far back the history goes. It's a new service and I've only been on it since the beginning of this year.
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