External Hard Drives for retina Macbook Pro - Thunderbolt vs. USB 3.0

Question

I already bought a G-Tech FireWire800/USB 3.0 external hard drive and just bought a second one.
And I just found out that USB 3.0 does not daisy chain (and the G-Tech drives only have one port each), and I also read that USB 3.0 hubs are not working well on the Mac.
I think of selling the drives again (at a loss, of course) and buying a Thunderbolt drive:
Here are the two options:
1. Western Digital:
http://www.bhphotovideo.com/c/product/890519-REG/Western_Digital_wdbusk0080jsl_n esn_8TB_My_Book_Thunderbolt.html
This drive seems to have two external hard drives. Would it be possible to use one of them as the main external hard drive, and the second one as the back-up hard drive?
2. G-Tech
G-Tech also sells Thunderbolt hard drives like this one here - but it's a RAID 0 drive - can I also use both discs separately as main drive and backup drive without using RAID 0? I just trust G-Tech more than Western Digital:
http://www.bhphotovideo.com/c/product/858463-REG/G_Technology_0G02272_8TB_G_RAID _External_Hard.html
What's your take on it?
Thanks!

Answer 1

The NEXT THING which is upcoming now that SSD prices are dropping is Firewire to SSD, or Thunderbolt to SSD.
Now THAT will be a "did you see that?" improvement.  A few home brew folks are already making their own.
run the two discs separately as one disc for storage? Yes, I however I have never had the desire or need to setup such a daisy chain. Autonomous data storage for safety is a rule I live by.
Backup VS. storage, is really a distinction without a difference.
My main PDF collection is 14 Terabytes, so...............  Yes, it depends on what you need, just remember the religion of storage, 2 copies is 1, and one is NONE.
Never consider any computer a data storage device, rather a data creation ,sending, and manipulation device. Any who thinks any data is safe on any computer, even copied upon multiple partitions is making a mistake
Never backup your data exclusively upon magnetic hard drives or flash storage, nor consider same since magnetic storage degrades over time even under ideal conditions
burn important data onto multiple copies of archival DVDs and store same in cool dark fireproof safes, hidden places, secret places, multiple places
always consider and expect thy computer’s hard drive to completely crash anytime, at all times, and keep a cloned and updated hard drive handy at all times to return to immediate productivity and avoid program and parameter reinstallation and tweaking