The Revisions metabox shows any backup copies of your page. Each time you click Save Draft or Update, a revision is saved. Revisions allow you to look back at the recent changes you’ve made and revert to an earlier version if necessary.
To find the Revisions metabox, you will need to go to the edit screen for the page that you want to see the revisions for. Still don’t see the metabox? You may need to enable it in your screen options.
Note: The metabox will not show until you have made some revisions.
Comparing Revisions
To compare Page Revisions, select a revision date in the Revisions section under the text editor. Select another date in the revisions list, click Compare Revisions, and you can check out the two versions of your page side by side, with changes clearly highlighted. In this example, we’re comparing two versions of the same page.
Restoring Revisions
To restore a previous version of a page, click Restore for that date and the page is restored back.