I'm setting up a backup storage device- This machine has Windows Server 2008, on a separate boot drive.

It has 8x 1TB drives, and uses a hardware RAID card.

My question is, which RAID configuration should I go for?

Initially, I was going to go with RAID 5 across all 8 drives, however members on serverFault have advised against it. I was just wondering why?

Some people have suggested 2 lots of RAID 5 configuration on 4 of the drives, then striping them...

I want to maximise the storage space, as this is a backup unit - will store SQL backups, Acronis Images, files, etc... It won't be for public access, so the I/O won't be that high I wouldn't think.