> after you lose some months of work worth data after two disk would be
> overwriten because of say - memory failure, or damaged by virus (on
> windoze) or simply by root's mistake doing rm -rf / , then you will
> replace each raptor by good DVD recorder (cheaper than SATA drive) and a
> bit of DVD+RW discs to copy your work.
>
> i'm sure your work files (not whole disk, but files that are true product
> of your work, and can't be rebuilt) will fit on few (if not one) DVD disc.
>
> Doing differential backup every day will take 10-20 minutes, and (at
> least in NetBSD) can be made while working.

DVD-RAM should be even faster (and more reliable) :)