If you accidentally deleted the content of your post and saved it, don't fret, WordPress records the content and title of your post and pages each time you click the update/publush button. WordPress keeps track of roughly the last 20 updates. You can access this data using the 'Revisions' feature.

1. Log into your WordPress admin.
2. Click on 'Pages' on the left hand side.
3. Click the page you want to revise/restore. It should say 'Edit Page' at the top of the page.
4. Click 'Screen Options' tab at the top of the web page.
5. Check the 'Revisions' check-box.
6. Scroll down the page and you can now see a list of your recent revisions in the 'Revisions' area.
7. Click on the revision date to view the page's content at that time.
8. Highlight and copy the entire block of markup.
   
9. Click the back button on the browser to get back to the 'Edit Page' view.
10. Click on the 'HTML' tab and delete all the content in the content area. The content area is the field just below the title field.
11. Paste the markup block you copied earlier into the  content field and click the 'Update' button.