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>
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