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My Passport Ultra 2 TB fails to back up any files

When I start a backup with WD Backup, I get a Notification that “Some files failed to backup”. In reality, all of the files failed to backup.

I have done a Quick Drive Test with the Drive Utilities and the drive passed. I also used the Drive Utilities to erase the drive to make sure that there is enough room for the new backup.

I get the same Notification/error.

How do I get the drive to backup my files?

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