Backup (fotos) from my passport to other "external" drive via usb!?

I have a mypassport wireless pro with sd card.
OK for backup fotos from sd card to my passport.
But can I have a second backup on another external drive on the usb of my passport?
How to manage that?

From external drive to my passport no problem via usb.
But the other direction?

Are you referring to connecting a Passport via USB to your current passport wireless? I don’t believe this is possible.

An other external drive via usb to mypassort.
For second backup of pictures from mypassport to that other external drive.
Not possible?



Again, don’t believe this is possible.
You can first transfer the pictures from one passport to the computer and from the computer to another passport.