# Improving storage efficiency in Magic Pocket, our immutable blob store

DevFeed: [Improving storage efficiency in Magic Pocket, our immutable blob store](<https://devfeed.tech/articles/improving-storage-efficiency-in-magic-pocket-our-immutable-blob-store-175.md>)

Original publisher: [Read original article](<https://dropbox.tech/infrastructure/improving-storage-efficiency-in-magic-pocket-our-immutable-blob-store>)

Author: Yasmin McDowell,Lawrence Good,Ilya Yakovlev,Andrew Cheung,Binoy Dash,Simran Jumani,Dmitriy Meyerzon,Mark Breitenbach,Ishan Mishra,Kazuaki Okumura,Mike White,Kevin Altschuler,Facundo Agriel

Published: 2026-04-02T17:00:00Z

Content type: article

Language: en

Sources: [Dropbox Tech Blog](<https://devfeed.tech/sources/dropbox-tech-blog.md>)

Topics: [Magic Pocket](<https://devfeed.tech/topics/magic-pocket.md>), [cloud-infrastructure](<https://devfeed.tech/topics/cloud-infrastructure.md>), [Monitoring](<https://devfeed.tech/topics/monitoring.md>), [Availability](<https://devfeed.tech/topics/availability.md>)

Tags: [availability](<https://devfeed.tech/tags/availability.md>), [backend](<https://devfeed.tech/tags/backend.md>), [cost](<https://devfeed.tech/tags/cost.md>), [data](<https://devfeed.tech/tags/data.md>), [efficiency](<https://devfeed.tech/tags/efficiency.md>), [infrastructure](<https://devfeed.tech/tags/infrastructure.md>), [magic-pocket](<https://devfeed.tech/tags/magic-pocket.md>), [monitoring](<https://devfeed.tech/tags/monitoring.md>), [operations](<https://devfeed.tech/tags/operations.md>), [process](<https://devfeed.tech/tags/process.md>), [scale](<https://devfeed.tech/tags/scale.md>), [storage](<https://devfeed.tech/tags/storage.md>)

## AI overview

Dropbox describes how it improved storage efficiency in Magic Pocket, its exabyte-scale immutable blob storage system. A change that reduced write amplification increased fragmentation and storage overhead, so the team introduced a layered, adaptive compaction pipeline along with stronger monitoring and controls.

## Source excerpt

By turning compaction into a layered, adaptive pipeline and strengthening our monitoring and controls, we made Magic Pocket more resilient to workload changes.