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You can enable post and page revisions by adding the following line before the "That's all, stop editing! Happy publishing" comment in the wp-config.php file. If the attribute is set to 'true' WordPress will store all revisions for the posts. Setting it to 'false' will deactivate revisions altogether. Finally, you can pass a positive integer to set the maximum number of stored revisions.

define( 'WP_POST_REVISIONS', true ); // true|false|integer
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