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It looks like they use something very similar to Erasure Coding in Ceph with RadosGW [1].

[1] https://ceph.com/planet/using-erasure-coding-with-radosgw/

They have been doing erasure coding since at least 2016 (it is mentioned in their original Magic Pocket post), just like almost all distributed storage system, so nothing really new there.

This article is about single-region storage vs. multi-region storage (and how to reduce the cost in this case). There is very little public info available about distributed storage systems in multi-region setup with significant latency between the sites.

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