You have a Basic App Service plan named ASP1 that hosts an Azure App Service named App1. You need to configure a custom domain and enable backups for App1. What should you do first?

Scaling out the App Service plan increases instance count for performance and availability, but it is not a prerequisite for enabling custom domains or backups.

Before enabling features like custom domains or backups, it is often a best practice to ensure the web application's internal configuration, managed through application settings, is correctly aligned. This can involve setting environment variables the application uses to recognize its custom domain or ensuring database connection strings are properly configured for consistent backups and restoration. These settings ensure the application correctly utilizes and recovers with the new external configurations.