But what happens when the OS goes nuts, and tells the RAID controller
to write crap all over your data?  Don't you just end up with a
redundantly imaged disk full of crap?

For myself, I copy data from the working machine to a server, and then
to an offsite backup server.   I'm also partial to putting critical
things onto thumb drives which can be easily unplugged.  Pretty hard
for a crashing OS to hose up data sitting on an unplugged drive.
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