The copies thing is a really only for laptops, where the likelihood of
redundancy is very low (there are some high-end laptops with multiple
drives, but those are relatively rare) and where this idea is better
than nothing.  It's also nice that copies can be set on a per-dataset
manner (whereas RAID-Zn and mirroring are for pool-wide redundancy,
not per-dataset), so you could set it > 1 on home directories but not

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