Error Code 39:44 File server  was unable to backup path 
Article ID: SCAN0005 Backup job fails with missing or incorrectly entered data path
Backup job fails with
Error code [39:44] File server  was unable to back up path . It is likely this path does not exist or the volume is offline.
Subclient content contains data path that either does not exist on the source or is incorrectly entered.
Review subclient content's data paths and ensure all data paths are present and correctly entered.