Backup fails partially in Azure Data Lake: "Error nbpem (pid=16018) backup of client
Explanation
Happens if you have a directory name + file name (including all '/') longer than or equal to 1,024 characters.
Workaround
You must have a path consisting of directory path + file name (including all '/') under 1,024 characters. The maximum directory length allowed is 1023 characters, including the "/" in the beginning and the end of the path.