Does OpenSandbox support syncing sandbox directories to S3? Any plans for built-in support?

[qiankunli]

Hi OpenSandbox team,

I'm currently evaluating OpenSandbox for building an AI agent sandbox environment.

In our use case, agents running inside a sandbox may generate or modify files during execution (for example under a directory like /workspace or /conv). Since sandboxes are typically ephemeral, we would like to persist these files to external object storage such as S3.

Our goal is to automatically synchronize a specific directory inside the sandbox to S3 so that files produced by the agent can be preserved even after the sandbox is terminated.

Example scenario:

• An agent runs inside a sandbox
• The agent reads/writes files under a working directory (e.g. /workspace)
• Files generated during execution should be synchronized to S3
• When the sandbox expires or is destroyed, the files are already persisted externally

I would like to ask:

1. Does OpenSandbox currently provide any built-in mechanism to synchronize sandbox directories to object storage such as S3?
2. If not, are there any recommended patterns for implementing this (for example using volumes, external sync services, or runtime extensions)?
3. Are there any plans on the roadmap to support built-in storage synchronization or persistent filesystem features for sandbox workloads?

Any guidance or best practices would be greatly appreciated.

Thanks!