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		 I was a bit surprised at the backup question.  
Mirrored  RAID is great for no down time unless you get data corruption like if you get hacked so I would want Mirrored RAID and versioned backups. 
 
(I do nightly versioned backups to my Mac mini using a combo of rsync and Time Machine so I don't really worry about this.) 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
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