I want to implement NAS solution for home usage, to keep data I care about. NAS offers RAID against disk failure, but what if the NAS box itself fails? Do I need two replicating NAS devices for a trustworthy storage? The amount of data is few Tb in size and while it is not many for a hard drive in these days, I think that much might be expensive to keep just in the cloud.
An idea that comes to my head is to buy two small single drive NAS boxes replicating each other. Would you recommend better solution?