Simple way using WD MyPassport software to backup the external drive itself


As the subject says, I’m looking for a way to get the SmartWare software to backup my “MyPassport”. I’m planning on keeping files on my external drive and editing them there (documents and photos) . As far as I can tell the included software only allows for backup the other way using the external hard drive as the backup. I want to a hard drive om my computer in order to backup the external drive. Do I have to get some other software or utility in order to do this? What is a good easy way to do it? I guess a sync function could work, although id prefer a more classic backup solution

Any thoughts?