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52192eb05f Backup mirror to BASEL: rsync of the sets after every successful run (#84)
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The operator-level extra beside the admin-configured Nextcloud target
(#103), unblocked now that the ONE→BASEL tunnel is stable again.

- sidecar: optional mirror step (mirror.ts) driven purely by env —
  BACKUP_MIRROR_TARGET (rsync-over-ssh), BACKUP_MIRROR_SSH_KEY (private
  key on the secrets volume, never in image or repo),
  BACKUP_MIRROR_SSH_PORT. Runs after the prune of every successful run,
  so --delete aligns the remote retention with the local one (the
  newest-complete-set guarantee carries over). Only set files travel
  (db-*.dump, files-*.tar.gz); status files and bundles stay local.
  Host key pinned via accept-new into .mirror_known_hosts on the backups
  volume; fixed remote modes (dirs 750, files 640, symbolic --chmod —
  octal needs rsync ≥ 3, macOS dev machines ship 2.6.9). rsync +
  openssh-client added to the sidecar image.
- status: additive `mirror` block in status.json (outcome, transferred
  count, lastSuccessAt carried across failures) — shown on the admin
  backup card; failures alert via a new backupMirrorFailed mail (de+en)
  while the local run still counts as succeeded.
- deploy/backup-basel.md: complete BASEL-side walkthrough — dedicated
  user dorfteich-backup with a /home/ home and a bash login shell,
  explicitly avoiding the Debian backup-user (UID 34) pitfalls
  (nologin shell rejects rsync sessions, /var/backups home), key
  placement through the api container onto the secrets volume, .env
  values, on-demand verification.
- tests: rsync-arg/stats-parsing units plus an integration suite against
  the real rsync binary (local target; skips where rsync is absent) —
  transfer, idempotent re-run (0 files), retention alignment, failure
  path carrying lastSuccessAt.

Verified live against the real BASEL host from a native sidecar run:
initial transfer, host-key pinning, retention alignment after a local
prune, idempotency, and the failure path (surfaced in status.json while
the local run stayed green). BASEL side provisioned per the doc.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwZ4jR4KFAPvpjWevfUGX1
2026-07-12 12:20:32 +02:00