Well, since the latest firmware update, I cannot maintain a Safepoint for the WD MyCloud 3TB.
I have attached a WD Passport Ultra (2TB USB 3.0) to the device, setup a recurring weekly Safepoint, and allowed it to create one immediately.
This morning, I looked at the MyCloud and noticed that it had crashed (I couldn’t even ping it). So, I power cycled the device and after it booted, checked the Web UI. My previously created Safepoint is gone.
This is the third time this has happened (i.e. previously created Safepoints are not showing up in the Web UI after restarting the device, even though the files are on the USB drive - I can ssh into the device, navigate to the mount point and see them).
This was all working before the last update.
So, for the time being, I am going to abandon using Safepoint and figure out another strategy to maintain a second copy of my files.