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		I have 4*2TB HDD drive in NAS.  now the storage is full and i have planned to upgrade 2*10TB.  Then how should i transfer exciting files to new 10TB hard drive. 
Disk-station model:  DS418j
	
	
	
	
	
 
 
	
	
	
		
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		Simply replace a drive and it will rebuild automatically. After replacing two drives you will see more capacity availableRAID calculator might be useful https://www.synology.com/en-uk/support/RAID_calculator?hdds=2%20TB|2%20TB|10%20TB|10%20TBI hope this helps.