Add at least 1 access node for SharePoint Online. For high availability (which is recommended for the first full backup), use 2 or more access nodes.
Before You Begin
You need the following information:
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Host name
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User name and password
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OS type
Procedure
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From the navigation pane, go to Manage > Servers.
The Servers page appears.
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In the upper-right area of the page, click Add access node.
The Add gateway dialog box appears.
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From the Select packages list, select OFFICE365, and then click OK.
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Click Install.