不能删除中间的任何私有映像，因为为了节省空间私有映像只存储映像之间的差异（称为 delta 修改）。

You can not delete any intermediate private images because private images, as we explained earlier, only store the changes between images in order to save space (called delta changes).

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选择存储备份映像的位置。

Pick a location to store the backup image.

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此外，工作流使用SSH在主机平台上存储虚拟映像。

Additionally, the workflows use SSH on the host platform to store the virtual images.

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