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Backup fails. Error: "Failed to lock the file"

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Backup to the cloud for a Dell Laptop. Error message is: "Failed to lock the file."

I excluded my One Drive folder.

Link to 'Help' on the error message does not take me to a place where this is discussed.

Just upgraded to Home Office Protect.

Running Norton 360. It's on other computers and they seem to get through the backups.

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Harlan, welcome to these public User Forums.

The first question is to ask what file is being referenced for the error message?  To answer this you need to look at the logs for the backup task.

You need to be using the new log viewer tool per the link below. 
MVP Assistant - a new tool, including new Log Viewer (Latest version 1.1.4.0, 9/27/2021)

If you have Disks & Partitions backups created on ATI 2020 or later using .tibx files, then look in the Backup Worker logs.

If you have Files & Folders backups using .tib files (or Disk backups from earlier versions using .tib files) or using Cloning then look in the Demon logs.

Other logs are shown by the MVP Assistant under the 'Active Logs' heading of the Log Viewer page of the Assistant.

The log files should be zipped to preserve their original file names if sharing in the forums and would need to be less than 3MB in size, otherwise you would need to share the zip file via a Cloud share service such as OneDrive, Dropbox etc.