Creating a duplicate SharePoint site for Testing purposes

Chris_Clark1968 You can create a SharePoint site manually in your tenant. Then you can create a site template from old site & apply it to the newly created site using PnP provisioning engine - this way you can have same lists, libraries, etc. in newly created site.

Then you can manually change the site references or data sources in your power apps to newly created site. Ideally you should use Environment variables with power platform solutions for such scenarios to avoid manual efforts.

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