I’ve got a My Cloud with all of our music, films, photos and so on stored on it. I have a Pi running Kodi to play the music and films, which works really well. The photos we take on our phones are automatically uploaded to the My Cloud and our laptop is backed up constantly too.
The My Cloud has its own backup feature, called Safe Point. I’ve got a My Book connected to the My Cloud, via USB and every night the Safe Point updates, backing up the My Cloud. Not an ideal backup, as the My Book is right next to the My Cloud, not remote from it.
I got both the My Cloud and My Book from the WD outlet store, as recertified and have had no problems with them in three years or so.