The easystore has backup software, the My Book does not. The My Book is encrypted with an ex-fat file system as well, so beware.
I have a 3Tb My Book that encrypts everything. it also had a RED drive inside. The My Book software also has a remote access feature where you can access your files form anywhere over internet. Which was cool.
Me, personally, I like the WD essentials. No wacky Linux format, no encryption, no backup. Just sweet old copy-and-paste. Red my files from anywhere, connect to anywhere. Done.