Review the Prerequisites and Considerations

Prerequisites:

For Backup account:

• Use a backup service account with Global admin permissions.
• Add impersonation permission for backup user to the Exchange Online backup account to connect the Exchange Online organization, perform backups and restore.

  Note: If you do not add the backup account to the Discovery Management role group and do not assign the Application Impersonation permission, backup fails.

• Associate the Backup user account with one exchange online mailbox.
• If Modern Authentication is set on the Office 365 tenant, install patch P00002119. For more information, see Modern Authentication.

For Backup proxy:

• Log in to the Console.
• Install Microsoft .NET Framework (version 4.7 or higher) and PowerShell (version 5.1 or higher) on the proxy server that is a 64-bit computer.
• Install Arcserve UDP Agent on the proxy machine where you want to run backup/restore.

Considerations:

• While backing up a large set of users, you can use exchange groups for better backup and optimisation. For more information, see Using Exchange Groups page.
• Default setting for exchange online backup uses 4 backup threads (one thread per user) at a time. You can also modify the threads in configuration file of Engine\BIN\Office365\Arcserve.Office365.Exchange.config as follows:
• <!--#region for multi thread-->
• <!--MultiThreadEnable default value:0. if enable, set 1.-->
• <add key="MultiThreadEnable" value ="1"/>
• <!--set how many thread will be used to backup mailbox. default value is 4-->
• <add key="MaxDegreeOfParallelismForMailbox" value="4"/>
• <!--#endregion-->
• We recommend to set the value from 1-5. The maximum possible value is 10. But, we do not recommend setting the value from 6-10.

Note: UDP 7.0 supports user mailbox, shared mailbox and mail enabled public folders. Room and Equipment mailboxes are not supported.