You can use RAID 5 or RAID Z (if you use an OS that supports) it offers both. If a drive dies it can rebuild the data when a new drive is installed in place of the one that has died.
I personally wouldn't rely on this alone for redundancy purposes though.
	
		
			
		
		
	
				
			I personally wouldn't rely on this alone for redundancy purposes though.
	
 
		