Directory Snapshots: Resumable project state for Sandboxes | Modal Blog

Introduced Directory Snapshots, a new feature for Sandboxes that allows specific directories to be snapshotted and mounted independently of the base image. This enables granular state management, separating system dependencies from application code, facilitating pre-warming of Sandboxes with project-specific code, and optimizing file loading by prioritizing snapshot contents. The implementation involves `snapshot_directory` and `mount_image` operations, leveraging Modal's existing lazy-loading container filesystem.