Request for Advice re RAID Setup  / Backup Options

I would be grateful for any comments on my RAID setup, or suggestions for improvement:
I have four LaCie Firewire drives. Each is 250 GB. Two are the Porsche design, and the other two are the ones designed to stack under (and resemble) the mac Mini. I'd like to not buy any additional storage hardware at this time.
I have two main needs for storage -- (1) my iTunes library, which is mostly Apple Lossless, and (2) backup of my PowerBook. These two needs presently take up about 300 GB.
Currently, all four hard drives are connected to a mac Mini. Both of the two pairs of hard drives is configured through OS X Disk Utility as RAID 0. Consequently, two fire wire drives of roughly 500 GB each show up on the mini's desktop. I mainly use the mini as a jukebox -- the video out connects to my TV, and the audio out connects to my receiver (through a buggy as he.ll M-Audio Transit, but that's another story). So the iTunes library for the mini lives on one of the RAID drives.
The other RAID drive serves as a backup. Using Silverkeeper, I incrementally backup the music library. Silverkeeper also backs up my PowerBook, when it is on the network.
Does this sound like the best way to go, if you accept that I don't want to get into a hardware RAID solution for now? Does OS X allow for software RAID 0+1? In other words, can I RAID the two pairs of drives independently as they are now, and then have them mirror each other? I'm not really worried about accidental file deletions and the like -- my biggest concern is one of these hard drives failing. If RAID 0+1 is available through software, is that advisable? Are there other alternatives I should be thinking about?
Any comments on this will be very helpful. Thanks in advance for your time.
PJP
PowerBook G4 15 | Mac mini G4 | 60 GB video iPod Mac OS X (10.4.6)
PowerBook G4 15 | Mac mini G4 | 60 GB video iPod Mac OS X (10.4.4)

Hi, PJP.
My take on RAID: Unless you're running a high-availability transaction server, IMO RAID is overkill for the home or SOHO (Small Office / Home Office) user. It's "cool" and has a certain amount of "geek" cachet, but as far as being practical for the average user, it adds an unnecessary level of complexity.
You may have specific reasons why you've decided to implement RAID, but from what you've described as what you're doing with your Macs, I don't really see the need for it.
Like you, I run backups to FireWire drives of all our Macs. I maintain at two current backups for each system, one backup per FireWire drive. This gives me the same kind of drive-failure protection for my backups without having to go the RAID route.
For advice on the backup and recovery solution I employ, see my "Backup and Recovery" FAQ.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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