Don’t know if this makes any sense whatsoever but perhaps the techs at WD are reading.
My Cloud Mirror (not Gen 2) has been successfully performing two remote back-up since I first set up the units about a year ago. Recently I set up an internal backup incremental mode, this had been happening but not as I anticipated but that’s another topic: Incremental Backup is working like differential Backup
The issue here is without notification of any errors all my back-ups suddenly stopped working on the 25th July 2016, I didn’t discover until 2 weeks later as no red error light came on. I manually ran the smaller remote back-up and it worked. I manually run the larger remote back-up it failed (error code 1500). But they still wouldn’t run themselves at the schedule time.
I had noticed that the internal incremental backup had made 25 folders saving the complete source on each occasion. I decided to delete this back-up. The next day both remote back-ups worked perfectly – was it a coincidence or is there a bug in the firmware?