WordPress saves revisions of each post or page after posting an article so they can be reverted or compared at a later date.

Post revisions are very useful if the website has many authors or a lot of content but may be unnecessary, often excessive, for a single author or small website.

There is no way to delete or disable revisions from withing WordPresses’ admin panel but they can be restricted or prevented via a simple file edit.

If you want to completely stop revisions from being saved just open wp_config.php in the main wordpress folder.
Just before the ending ?> insert:

define('WP_POST_REVISIONS', false); // Disable revisions
define('AUTOSAVE_INTERVAL', 600); // 600 seconds or 10 minutes

To reduce the number of revisions per post or page from 25 just repeat the above but add the following…

/* Save 3 revisions per post or page */
define('WP_POST_REVISIONS', 3);

Some people may consider this to be somewhat of a pedantic process but can make a huge difference on a development server or a website with a very large content base!