also sprach Les Mikesell <lesmikesell AT gmail DOT com> [2011.04.27.1507 +0200]:
> > I think a safer alternative would be to do what the OP proposes
> > -- that way you always have one safe copy not part of the RAID
> > in case something messes up....
>
> You need that anyway, although starting from scratch it doesn't
> matter since you have nothing to lose.  When you were trying to
> convert an old 2-member set to 3, you should have failed/removed
> one of the existing drives (at least logically) until you had
> added the first external and then rotated it offsite, after which
> you would always have the working spare.  There always is a danger
> that the current sync will hit an error on the source leaving the
> whole set unusable, although this should be greatly reduced when
> the source is a 2 member mirror.

There's also drdb, which provides RAID1-over-the-network. It seems
like an excellent way to maintain an offsite copy of the backup
topdir.

-- 
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