Supported external drives for Safepoints made using the WD MyCloud 2TB

I want to use a WD Passport Ultra 2 TB drive as the external drive for a safepoint connected to a WD MyCloud 2 TB. Will this work? I also have an old 1 TB Seagate GoFlex desk that I might want to use (as long as the MyCloud has less than 1TB stored on it, that is). Will this work?

Yes.

The My Passport Ultra is a drive supported with the WD My Cloud as many other USB drives. Make sure the drive is formatted on a compatible file system.