Cloning a page and post does not have to be too difficult. You can always try manually copying/pasting your post/page content. But you will also pay attention to status, excerpt, and other data associated with your work. Thanks to Duplicate Post, you will have an easier time cloning the work you have done in the past.
Once you install this plugin, you can use the Clone link to immediately create a duplicate version of your work. Your post will be available in form of a draft. The plugin does give you some option on how your content gets copied. You can choose to copy page/post status, excerpts, and page/post data. Categories and tags can be copied too.
Duplicate Post enhances WordPress and gives you multiple ways to create drafts/clones of your previous work. A nice plugin to use if you want your previous work as a template for your future posts.