The Office 365 guided setup helps you create a server plan to use for SharePoint Online and an SharePoint Online app that will contain the sites that you want to back up.
In the guided setup, you can use either the express configuration option or the custom configuration option:
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Express: The express configuration automates some configuration steps, but it requires you to use the Microsoft login information to authorize the Azure app.
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Custom: The custom configuration is a manual process. Use this option if you want to enter the app details manually.