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You can see the uploading will be delayed if the configure remoteLogKeepLatest is false. And After the change, the remote tiered storage redundancy will be reduced with delayed upload.
You can refer to the test case and result: https://github.com/apache/kafka/pull/20913#issuecomment-3547156286

The storage compare in my test:  P2 (host on the machine with the delay upload) is about 50% of P0 or P2.

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BTW: Here are some additional thoughts/considerations.

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