Using RAID 1 Hard Drive as an encrypted Time Machine Disk???

I'd like to purchase a RAID hard drive to use as a backup for my iMac with Time Machine, but a review on the Apple store site (emphasis mine) says:
"LacCie 4TB 2 big Thunderbolt Raid Hard Drive
Written by Alexander S from Calgary
Apr 9, 2012
Hey Guys!
Impressive, very quiet, in fact the quietest of all the drives I had. The speed increase is nice too, but of course, if the source is slower, you won't benefit from the speed that it is capable. Quiet is worth the price.
I did notice that, if I use it as a raid configuration, Disk Utility won't do permissions, unless I boot from it, unlike my firewire drive. All my drives and computers are encrypted, however you can't encrypt a raid configuration. Even using it as Time Capsule, it won't save to it, so it used image encryption. Haven't research this further yet.
One very nice thing I notice, there is no lag or spinning ball when you are waking up the unit, unlike the other drives using USB or Firewire. In fact, that was so annoying, that I would unmount the firewire drives asap when not needed. No spinning ball wakeup lag make it worth the money.
The large LED blue button is bright, you wouldn't want this where you sleep, however I don't need a night light in my office. LaCie may want to consider an option to dim or turn off the LED if desired.
When starting up my computer, the bluetooth keyboard and mouse, trackpad, usually take some seconds before I can move the mouse and enter password. Funny thing, it is available instantly when booting from the raid unit. I wonder why?
This is the results of about two week of use. I am seriously considering get another unit to match."
I encrypt my Time Machine backups. I'd like to run a backup drive in RAID 1 for safety. Does anyone know if this is possible?
Thank you!
(OS 10.8.2)

I wouldn't use RAID for TM, but...
http://pondini.org/TM/2.html
https://discussions.apple.com/thread/4062015?start=0&tstart=0

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