You can copy a page, to create a duplicate of the page content. You will need to rename the page, because a page name must be unique within a space.

You need 'Create Pages' permission, which is assigned by a space administrator from the Space Administration screens. See space permissions or contact a space administrator for more information.

To copy a page:

1.  Confluence will open a copy of the page in the editor. By default, Confluence will name the page 'Copy of <<original page name>>'.
2. Rename the page and make any other changes required in the body of the page.
3. If you need to move the new page to a different space or a different parent, you can edit the Location. Refer to the instructions on moving a page.
4. Click Save.