Best way to move backup....
 

I have copied a backup of my hard drive on an iMac to a portable external drive. I want to take that backup and transfer it to an off-site external drive. How do I make the transfer? Simply put all the backup folders in a new folder and drag and drop to the off-site drive?

No, you can't drag and drop...unless this is an image. Is this drive a network drive of some sort?

Yes, it is an external drive hooked into an Airport Extreme.

OK. If it's an image you can drag and drop it if you'd like.