Autosave when editing Pages

It would be useful if Confluence autosaved Pages every X (configurable) seconds when editing a Page. It could be stored as a "temporary" page without creating a new version (should be stored per user). Then each user should be able to restore an "autosaved" version that was not actually saved by pressing a button.

This is because we can lose our work if something happends to windows / internet explorer / mozilla or even if some program triggers a page load on the same window we are editing the page. All of these happened to me

An example of this behaviour is GMAIL's autosave.