I was using 3.75PB (assuming 45GB compressed 6:1 so 7.5GB per person). I'm not certain, but my intuition is that, even paying AWS for the CPU time for compressi

I was using 3.75PB (assuming 45GB compressed 6:1 so 7.5GB per person). I'm not certain, but my intuition is that, even paying AWS for the CPU time for compression, that would be cheaper than paying for the uncompressed transfer charges. But, yes, even for my lower storage numbers, for "EU (London)", even for just 3 years (a conservative enough lifespan for an HDD), S3-Standard would be almost $2.97M, S3-Standard-IA would be $1.77M, S3-OneZone-IA $1.4M, and Glacier would be merely $608k. Of course, that excludes transfer charges.