Portable USB HDD vs Powered HDD

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Hi All, 

I need to save 4 TB of my family photos + videos onto two HDDs. 

I have the following options 

1. Use two 4TB WD 4TB Elements Desktop Hard Drive - USB 3.0 - WDBWLG0040HBK-NESN (These are powered with an external adaptor)

I plan to use two such HDDs so I have a spare if one fails


2. WD 4TB Elements Portable External Hard Drive - USB 3.0 - WDBU6Y0040BBK-WESN (Non Powered only via USB) 

I can use two of these to save all data 


3. Use 1 Hard disk 4 TB (Powered with adaptor) and a 2nd HDD (4 TB Powered with USB) 


Please advise. 


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Functionally makes no difference. The portables are a little more simple I suppose in the event the power cables fail or someone wants to read the contents of the drive in a bank vault or something. 

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