Raid 1 will mirror your disks. You'd have 73GB of storage, and then incase drive failure would happen you'd simply replace one of the drives, and you wouldnt loose much/any data.
Raid 10 is baiscally the same thing, though you need 4 drives it gives better fault tolerance and rebuild performance. and you'll have roughly 146GB of storage
See if they offer Raid 5 setup, get 3 disks and you'll get the 146GB of storage, and the security and backup capibilties still. And should be a little more cost effective
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