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Very interesting indeed.
About the storage space: they only save the html code, not the images; by doing so, the space required is not so big (thatīs how google manages to keep a copy of the source codes of the pages they index).
I once heard from a guy who works with SE design that ALL the Brazilian pages took just a few Megabytes to be stored. Of course, US web is much bigger, but so are the budgets.
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