After discussing with a few other users, I think setting up a daily dump that lasts 90 days in tandem with monthly dumps will help provide the best of both worlds. The monthly dumps will still kick off at the beginning of each new month while we also dump daily by 6am and keep...
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... the previous 90 days worth of daily dumps. Once it gets to 90 days, we'll drop the oldest daily dump. That way people can grab a particular day if needed without having to download 25+ gigs just to get a few hours / day of data.