Hi Karen,
Please check if the suggestion provided by Jayden is helpful.
Then here we mainly focus on general issues about Outlook client, but your issue is about Windows backup. If you need further assistance on this, it is suggested to post a new thread in the following dedicated forum for Windows Backup:
https://social.technet.microsoft.com/Forums/windowsserver/en-US/home?forum=windowsbackup
The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Best regards,
Yuki Sun
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