Local memory buffering on the thermostat

If a thermostat is offline (no WiFi signal) for a few hours, does it utilize a local memory buffer such that when the thermostat reconnects to WiFi and the Ecobee servers, the server will use that buffered data to back-fill the runtimeReport and meterReport data gaps on the server? If so, many hours of runtimeReport and meterReport data does the thermostat buffer?
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