Hitachi 400gig HD as a 2nd Drive in RAID1

Hitachi HDS724040KLSA80 - I am in the process of ordering one of these as it is the same HD that came in my PM-G5 2.3 as the standard drive. I wanted another identical drive as an internal RAID backup drive.
Goal: To have a 2nd drive as a backup/mirror of the 1st drive.
- I am considering to RAID1 the two drives together as a backup solution.
- I want an internal solution that does not involve more cabling and peripherals lying around.
I have also considered the new 500 gig version as its faster and has more storage, but am swayed by having an identical HD (in speed and storage spec as the original). Is this necessary?
Another idea I had was to get 2 of the newer 500 gig drives and use them and take out the original drive and use that in an external casing as portable/external backup solution (can share data between my 4 Macs). But will this invalidate my 3 year Applecare?
(I am a home computer user and have tons of video on the HD as well as photos, ALL our cd's, so a multimedia user, as well as the regular office, internet stuff.)
I am new to this, but have a good BASIC understanding of all this, but would appreciate any input from more knowledgable folk.
Appreciate any and all help.
PowerMacG5 dual2.3,400HD,1.5gRam,20"CD + iMacG4-17,80HD,1gRAM Mac OS X (10.4.3) Apt Exp & Ext,iSight,iPod,BT m&k,Mighty-mouse,eyeTv,Nikon D70

OK, so I've shelved the RAID1 idea. Seem the popular opinion is that that is not the way to go for backup purposes.
Q: So what benefit do I derive from installing a 2nd HD inside the computer?
I don't really need the storage space (Yet!) as 400 gig suffices for my home needs, but I do want a secure systematic (nightly, or even weekly backup of my Home Directory, or selected parts of - I don't need to backup all the TV shows the eyeTV records!)
I just thought that putting the 2nd drive within the computer would save space and be ALWAYS ON/READY for backup at a faster rates. If I could get an internal solution that would be the best... What do you guys think?
Is an external HD the best solution for backup? Any recomendations? (Lacie seems to get bad reviews EVERYWHERE!) I would like a 400GB HD as minimum if possible.
Allan, as some people (inc. you I think) have 2 internal drives, 1 for the OS, and a 2nd one for data (iTunes music, iPhoto pictures, iMovie7iDVD projects etc...). Then this is backed up on a regular basis on to an external drive as the back up solution. What drive would you recommend as the OS (boot?) drive, as I guess it can be a smaller 80gig drive? Then I can leave the 400gig OEM drive in its place as the data drive and buy an external 500gig backup drive for the whole lot.
Sorry if I sound a bit basic, I'm new to this and don't want to:
a) get lost in the tech info
b) spend hundreds $ buying multiple 400gig drives etc.
c) have the best backup solution
I don't want to loose everything from a HD failure again (as on my PB-12).
I appreciate all your comments and recomendations.
iMacCat.

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Attachments:
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You might find some help by reading the following:
Go to "Toshiba Forums" and scroll down to "Satellite Laptops::all others" open it and find the "Subject", "Second internal Hard drive P775----" with 1040+ Views (Note there are two listings on this subject). It should make for interesting reading.
TC

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