Comment 2 NAS units synched (Score 1) 669
You buy/make 2 NAS with RAID 5 or 6. Your friend somewhere far away does the same. One of your NAS's becomes his, and vice versa. You set them up to mirror each other. If your house burns down or the contents get stolen, you buy/make two new NAS and get the data back from your friend.
Upgrade in 5 years and continue indefinitely.