Thanks everyone, and I'll certainly check out the links and names provided.
I'm using this for home use right now but it could roll into something more later.
I basically have data on 3 PCs that needs to be backed up to a RAID setup in one of those 3 PCs. I don't need to backup the entire hard drives on these PCs, just certain files. For example, 4 folders on PC2, 3 folders on PC3 and 6 folders on PC1 need to be backed up regularly to a RAID setup on PC1.