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Disk

Fast NVMe storage at /workspace. Set the size in cassian.yaml:
disk: 50G
Persists across sessions. Follows you if you switch GPU types.

Cloud storage

Unlimited storage at /workspace/storage. Enable with --cloud-storage during init, or add to cassian.yaml:
storage: true
Good for datasets and model weights. Does not sync locally.

Exclude

Folders you do not want persisted:
workspace:
  exclude:
    - "node_modules/"
    - ".venv/"