Today I've committed a little plugin to the repository that is called Versioning of entries (serendipity_event_versioning).
It about does what its name suggests: Once installed, it will store each change to your entry in a seperate table. From there you can restore previous versions of your entry.
You can also configure the plugin whether to show revisions of your entries to the public. The plugin has a lot of room for improvements in the future, like offering a "diff" view of your entry revisions or other pretty things.
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