Hard Drive and RAID

I'm trying to figure out what would be better for my backup configuration.

I'm looking at the following.
Western Digital Caviar RE SATA $115.99 each X 2
SuperSwap 1100 $70 each X 2
FastTrak S150 SX4-M $206

Here are the questions i have.
It says i can only use a Serial ATA/150 Drive
Is the western digital i chose a 150 drive?

serial ata versus ide, which is better? does serial ata require a special configuration on the mother board?

IDE RAID will mean that a lot of the space in your case will be cables.
If the RAID card supports Serial ATA, the motherboard doesn't have to.

SATA is by far superior. And unless you are setting up a server, you don't need the Super Swaps. Besides... those are meant to be used with more than 2 drives.

I don't know about your drives tho... I've never heard of an RE model and I can't find it on the site. And you really don't need to spend that much on a RAID card. I bought mine for about $20 bucks off of newegg.

this is what i came up with

Maxtor DiamondMax Plus 9 (Hard Drives)
SuperSwap 1100 (Removable Hard Drive Enclosures)
FastTrak S150 SX4-M (RAID Card)
Capacity:
160GB
Fault Tolerance:
Basic Error Prevention Features
Advanced Error Prevention Features
Price:
$530

it is for a raid server backup system.
thanks for you input.

follow up question on RAID
i'm trying to prevent a large back up file from being pushed on a network that can not handle the size of the backup.
so instead of pushing to another resource on the network, tell me if this would prevent the unneeded traffic.
having a 2 drive mirror, RAID will automatically in the RAID card send a duplicate of the data stored on the database server to both drives, concealing all data push to the server.
is this accurate?