Automatic backup?

WD External Drives WD Portable Drives
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If you have a drive with WD Smartware then you can use it to move your files.

Personally I recommend to drag and drop the files you want to move to the drive.  This way you can access it at any time without the need o using a software.

If you want to do it automatically then you may find many many backup apps over the internet that can work for you with this drive.