As a follow-up to my question Disaster recovery backup of files/photos for personal use, it sounds like for personal disaster-safe backup, multiple rotated hard drives is the way to go.
One of the answers suggested a NAS RAID setup, so after some searching I found a very affordable product that looks really cool, the D-Link 2-bay network storage enclosure.
However, this NAS has some pretty cool features that I would love to use and not just lock away in a box, such as becoming my streaming location for Xbox, etc. It is a 2-bay enclosure, so what I am thinking is that I can buy 3 drives, and keep two of them in the NAS, and one in the fire-proof safe. I would rotate them weekly.
Is this possible with a RAID-1 array? Would it have to wipe the whole drive to rebuild it every time? Does the rebuilding happen automatically? And last question, if it does have to rebuild the whole partition on the drive every time, would this excessive writing reduce drive life?