There are some that could be reduced in size without too much issue, particularly those at 600 dpi. It would be possible to run a script that locates the scans that are deemed to large in kb terms, and downsizes them to something more appropriate. I'm not sure how much of a dent that would make in the total though. It might only shave off a couple of GB depending on how aggressively we decided to shrink them. 40,000 high-res scans are still going to take up a lot of space.
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