You can do full-site search and replace with the NS Cloner in two ways – on a new cloned site (in Standard Clone mode), or on an existing site (in Search Replace mode). To search and replace on an existing site, all you need to do is:
Go to the Cloner admin page, and set the Mode dropdown to “Search and Replace”.
If on a multisite, select one or multiple sites you’d like to apply the replacements on.
Enter an unlimited number of search terms and their desired replacements.
Click “Search/Replace” and watch the Cloner make all your replacements across your whole site (or sites) in seconds, including safely modifying serialized options values.