[dnanian]

Well, the only LaCie Hub I can find is an actual hub, not a drive, so I'm not quite sure what you're using. But, if you're going to use Time Machine with one drive, you can copy that data to the other with SD, but you should turn TM off when you do it.

However, I'd create a real, bootable SD! backup on a separate partition on the drive (see Help > Frequently Asked Questions in SuperDuper!) so you have a bootable backup in addition to your Time Machine data.