Files that fail to backup location

Whenever I try to backup my laptop, I get a message that not all files were backed up. (My Passport Ultra). I read https://support.wdc.com/knowledgebase/answer.aspx?h=p2&ID=17562&lang=en&p=304 and https://support.wdc.com/knowledgebase/answer.aspx?ID=17562&lang=en
In both postings, there is this statement:
Long Filename / Folder Paths Too Long

Folder paths may be too long and prevent files from being backed up. The maximum length of a pathname is 256 characters, and includes parent directories, child directories, and the file name. The backup software will attempt replicate the source path when creating a backup destination path. To rectify this issue, shorten the source folder path.

The problem is, I don’t see any way to find out what the path is for the files that failed to backup, or how to find where they are located at all. Is that possible?