I wonder if the backup job names you are creating has space(s) in them. See → http://community.wd.com/t5/WD-My-Cloud-EX4/Backup-not-working/m-p/792087#M2554
I wonder if the backup job names you are creating has space(s) in them. See → http://community.wd.com/t5/WD-My-Cloud-EX4/Backup-not-working/m-p/792087#M2554