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I get the use case, but in most cases (and particularly this one) I'm sure it would be much better to implement that client-side.

You may have seen in the WARC standard that they already do de-duplication based on hashes and use pointers after the first store. So this is exactly a case where FS-level dedup is not all that good.

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WARC only does deduping within a single WARC, I'm talking about deduping across millions of WARCs.

That's not true, you commonly have CDX index files which allow for de-duplication across arbitrarily large archives. The internet archive could not reasonably operate without this level of abstraction.

[edit] Should add a link, this is a pretty good overview, but you can also look at implementations such as the new zeno crawler.

https://support.archive-it.org/hc/en-us/articles/208001016-A...

Ah cool, TIL, thanks for the link. I didn't realize that was possible.

I know of the CDX index files produced by some tools but don't know anything about the details/that they could be used to dedup across WARCs, I've only been referencing the WARC file specs via IIPC's old standards docs.

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