Directory Snapshots: Resumable project state for Sandboxes

Modal has launched Directory Snapshots in public beta, allowing users to capture and later mount specific Sandbox directories independently of the base image and the rest of a filesystem. Unlike full filesystem snapshots, this granular approach lets system dependencies, application code, and generated artifacts evolve on separate lifecycles, enabling updated base images to be combined with preserved project state. The feature supports workflows such as coding agents that retain user projects while receiving security or runtime updates, warm Sandbox pools that attach project-specific files only when assigned, and faster startup through prioritized loading of frequently accessed directories. Directory Snapshots persist for 30 days after last use and complement Modal’s existing filesystem snapshots for complete environments and memory snapshots for rapidly restoring active process state.

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