Configure Backup as Administrator in Windows 10

I would like to use the windows 10 backup feature to backup files on an exteal harddrive but the backup should run as administrator to prevent ransomware from encrypting the backup files if the harddrive is still connected.

I activated the built in administrator account and configured it to backup the contents of my non administrator user and revoked all write / delete access for my non administrator account.

But as far as I can see the backup only runs if I log in with the adminstrator account.

Is it possible to configure the backup somehow that it runs in the background when I log on with my non-administrator user?

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