When a Z gateway goes offline, the Z sensor will store data for roughly 10 days if on a 5-minute interval and 30 days if on a 15-minute interval. However, this can vary based on temperature and humidity sensors on both ports. If the devices are offline beyond that time then the oldest readings will get dumped/lost first.
When the Z gateway comes online again, the Z sensor will dump 2x stored readings for every 1x real-time reading.
Example: If the Z sensor was offline for 30 hours, it would take approximately 10 hours or 1/3 of the time to backfill.
At each backfill interval, the Z sensor sends:
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