/sirius-x/docs/#host — Pattern C section extended with:
* "The dual-host recipe, end to end" — four-step publish sequence: edit
locally → scp to VPS → sia-upload → verify both.
* "Auto-backup: one command, both mirrors" — a Bash wrapper any operator
can drop into their repo to publish to both mirrors atomically.
* "Automate the reverse — VPS → Sia periodic backup" — a cron snippet
for setups whose primary publish is straight-to-VPS.
* Note on which mirror is authoritative (chain record decides).
scripts/mirror-bcnr-site.sh — general-purpose implementation of the
recipe. Takes local-dir, ssh-dest, sia-bucket-key + optional verify URLs.
Exit codes distinguish scp failure vs sia-upload failure vs verify
failure so a CI/hook can react. Trims trailing slash from Sia bucket key
so sia-upload.js doesn't produce "bns/x//file" paths.
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