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Convert /mnt/pve/oracle-backups from a directory on the pveelite rootfs into a dedicated ZFS dataset rpool/oracle-backups so it can be incrementally replicated to pvemini. zfs-replicate-oracle-backups.sh runs every 15 minutes from cron on pveelite and uses zfs send/recv over the cluster's internal SSH (direct IP, /etc/pve/priv/known_hosts) to avoid Tailscale magicDNS detours that broke the first attempt. The destination dataset is set readonly=on so accidental writes on pvemini cannot diverge it. Snapshot pruning keeps 5 rolling copies. nightly-backup-mirror.sh ships a third copy nightly to pve1's backup-ssd (ext4 SATA) — different physical disk, different filesystem, different node — guarding against the failure mode where both pveelite and pvemini are simultaneously unavailable. The same script tars /etc/pve and rotates 14 days of cluster config archives, since pmxcfs is in-RAM and a multi-node quorum loss would otherwise take cluster config with it. The old directory is kept as oracle-backups.old-DELETE-AFTER-2026-05-02 on pveelite for one week as a safety net. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>