Can you use My Passport to backup another external HD?

I couldn’t find a way to do this in their software, other than manually making a directory and pulling the files over myself…

My 500 GB external network HD is making funny noises, so I bought this as a backup.  The backup software works great for my main C drive, but I can’t get it to “see” my network HD.  Do I have to do manual backups?

Thanks!

You can copy and paste your files over.