| 摘要 |
To enable a flexible snapshot to be invoked through a simple site configuration by storing a difference updated when updating a content as history information. When updating a content stored on a storage unit into a new content, history information is created by comparing the new content with a content when updating, request information for the content is received, the history information corresponding to the request information is searched from the storage unit, the content is regenerated based on the history information as a result of the search, and the regenerated content is provided to a requester.
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