# E2B 2.55.0 adds a filesystem-only snapshot mode

published: 2026-10-13T00:22:37.023Z
topic: infrastructure
source: https://github.com/e2b-dev/E2B/releases/tag/e2b%402.55.0
url: https://aiagentnews.io/stories/e2b-2-55-0-adds-a-filesystem-only-snapshot-mode

E2B has released version 2.55.0, which lets developers choose between full memory snapshots and filesystem-only snapshots. The release also deprecates the keepMemory option in favor of a new mode setting.

The new SnapshotMode type, with the values 'full' and 'filesystem', can be passed to createSnapshot and create_snapshot. In filesystem mode only the disk is persisted, so snapshots are smaller and quicker to take, and sandboxes created from them cold-boot from disk instead of restoring memory. The original sandbox keeps running in either mode.

When no mode is given, the API default of a full memory snapshot applies. The pause() method and the lifecycle onTimeout pause object form accept the same mode setting. The keepMemory option is deprecated, with keepMemory: false equivalent to mode: 'filesystem', but it still works, and passing both options raises an InvalidArgumentError or InvalidArgumentException.

A separate patch change removes some empty-chunk checks from command output handling. According to the changelog, envd never sends empty output chunks, so behavior does not change.

## Why it matters if you build agents

Agents that pause or snapshot sandboxes can now choose a smaller, faster filesystem-only snapshot when memory state is not needed, but those sandboxes start fresh from disk rather than resuming in-memory processes.

Code that still uses keepMemory can move to the mode option, since passing both options throws an error.