Post Revisions are a feature introduced in WordPress 2.6. Whenever you or WordPress saves a post or a page, a revision is automatically created and stored in your WordPress database. Each additional revision will slowly increase the size of your database. If you save a post or page multiple times, your number of revisions will greatly increase overtime. For example, if you have 100 posts and each post has 10 revisions you could be storing up to 1,000 copies of older data!
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