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I'd use zfs (consider freenas as your os, i like it) with raid-z3 (triple-parity, thus 3 drives may fail w/o data loss) on the remaining 7 drives. You then may use zfs snapshots + replication to the other machine or just use a cron job to wol the backup machine and simply run rsync at a certain interval.

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The zfs question is one I'm debating. I actually already use FreeNAS on the backup server and it seems to be doing well. For the primary server I want an OS I can do more with on, so I'd probably throw something like CentOS on it and then run VMs for specific tasks or to use more bleeding edge distributions. I suppose I could try zfs in Linux.

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