local data cache on fingbox for analysis during offline/noCloud

Recently, I had internet outages which eventually resolved to a hardware defect on the cabelmodem. During the hours-long offline intervals, I tried to analyze with fingBox. This was miserably ineffective, because all data on fingBox (when did each outage start and end, when did internet flicker back online for short intervals, which internal device might be disruptive and involved) was NOT available when no cloud connection could be established. How can this be overcome? Could there be a LOCAL cache of, say, last 1 hour, last 6 hours, last 12 hours, for offline analysis of breakdowns and disturbances?
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