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This entire article can be summarized as the following: RAID is not a replacement for backups.

Sun/Oracle, and a lot of popular third party documentation, has said as such very openly, and commands like zfs send/recv exist to easily automate zfs cloning (to backup from one zfs fs to another, for example, if you choose to do it that way).

I suspect whoever wrote this missed the boat on why zfs works.

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