Can't retrieve my files from my passport drive

WD External Drives WD Portable Drives
10

So, do I understand you correctly? I should always have a second backup of all data, for instance onto DVD or CD media, at least? In addition to the WD external drive?

Is this because they are so very delicate or what?

How do I run a test now to see if I can retrieve my files from the wd external drive?