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The compressed size is 20pb, so it’s about 500k per month in S3 fees

Indeed. They benefit from a discount, but we don't know the discount figure.

To further reduce the storage costs, you can use S3 Storage Classes or cheaper object storage like Alibaba for longer retention. Quickwit does not handle that, so you need to handle this yourself, though.

Logs should compress better than that, though, right? 5:1 compression is only about half as good as you'd expect even naive gzipped json to achieve, and even that is an order of magnitude worse than the state of the art for logs[1]. What's the story there?

[1] https://news.ycombinator.com/item?id=40938112

I would probably build my own storage pods, keep a day or a week on cloud and move everything over every night.

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