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Right now, I only have around 300GB of SSD to cache image, they got filled up in a day. Given the usage, I'd need 1TB of SSD to cache 3-5 days' worth of "recent images". 2TB for 7 days. I'm not planning 2TB but 1TB is doable.

The system will cache an image if it is being requested 3 times in the span of one minute.