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This KIP proposes an optional, topic-level feature that provides an opportunity for cost savings on remote storage when the scenario is suitable to use.

Currently, Kafka's tiered storage implementation uploads all non-active local log segments to remote storage immediately, even when they are still within the local retention period. 
This results in redundant storage of the same data in both local and remote tiers.
Image Added

We can see the one real redundancy example in the following picture. (I just highlight only one segment.)

 Whenthere is no requirement for real-time analytics based on remote storage directly. It has the following drawbacks:

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