media: add nightly config backup to Cloudflare R2 via restic

Backs up all service config PVCs (Jellyfin, Radarr, Sonarr, Prowlarr,
qBittorrent, Bazarr, Seerr) at 3am daily to legion-media-backup R2 bucket.
Media files are excluded — they are re-downloadable.

servers/legion/k8s/media/backup-cronjob.yaml

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+# Nightly media config backup — backs up all service config PVCs to Cloudflare R2 via restic
+# NOTE: Does NOT back up actual media files (movies, TV, etc.) — those are re-downloadable.
+#       Only backs up app configs: Jellyfin, Radarr, Sonarr, Sonarr, Prowlarr, qBittorrent, Bazarr, Seerr.
+# Schedule: 3am daily (offset from Gitea backup at 2am)
+# Retains: 30 daily / 12 weekly / 6 monthly snapshots
+apiVersion: batch/v1
+kind: CronJob
+metadata:
+  name: media-backup
+  namespace: media
+spec:
+  schedule: "0 3 * * *"
+  concurrencyPolicy: Forbid
+  failedJobsHistoryLimit: 3
+  successfulJobsHistoryLimit: 3
+  jobTemplate:
+    spec:
+      backoffLimit: 2
+      template:
+        spec:
+          restartPolicy: OnFailure
+          containers:
+            - name: backup
+              image: restic/restic:latest
+              command:
+                - /bin/sh
+                - -c
+                - |
+                  set -e
+
+                  # Init repo if first run
+                  restic snapshots 2>/dev/null || restic init
+
+                  echo "Backing up media service configs..."
+                  restic backup \
+                    /jellyfin-config \
+                    /radarr-config \
+                    /sonarr-config \
+                    /prowlarr-config \
+                    /qbittorrent-config \
+                    /bazarr-config \
+                    /overseerr-config \
+                    --tag media \
+                    --tag legion \
+                    --host legion
+
+                  # Prune old snapshots
+                  restic forget \
+                    --keep-daily 30 \
+                    --keep-weekly 12 \
+                    --keep-monthly 6 \
+                    --prune
+
+                  echo "Backup complete."
+                  restic snapshots --latest 3
+              envFrom:
+                - secretRef:
+                    name: media-backup-credentials
+              volumeMounts:
+                - name: jellyfin-config
+                  mountPath: /jellyfin-config
+                  readOnly: true
+                - name: radarr-config
+                  mountPath: /radarr-config
+                  readOnly: true
+                - name: sonarr-config
+                  mountPath: /sonarr-config
+                  readOnly: true
+                - name: prowlarr-config
+                  mountPath: /prowlarr-config
+                  readOnly: true
+                - name: qbittorrent-config
+                  mountPath: /qbittorrent-config
+                  readOnly: true
+                - name: bazarr-config
+                  mountPath: /bazarr-config
+                  readOnly: true
+                - name: overseerr-config
+                  mountPath: /overseerr-config
+                  readOnly: true
+              resources:
+                requests:
+                  memory: 256Mi
+                  cpu: 100m
+                limits:
+                  memory: 512Mi
+          volumes:
+            - name: jellyfin-config
+              persistentVolumeClaim:
+                claimName: jellyfin-config
+                readOnly: true
+            - name: radarr-config
+              persistentVolumeClaim:
+                claimName: radarr-config
+                readOnly: true
+            - name: sonarr-config
+              persistentVolumeClaim:
+                claimName: sonarr-config
+                readOnly: true
+            - name: prowlarr-config
+              persistentVolumeClaim:
+                claimName: prowlarr-config
+                readOnly: true
+            - name: qbittorrent-config
+              persistentVolumeClaim:
+                claimName: qbittorrent-config
+                readOnly: true
+            - name: bazarr-config
+              persistentVolumeClaim:
+                claimName: bazarr-config
+                readOnly: true
+            - name: overseerr-config
+              persistentVolumeClaim:
+                claimName: overseerr-config
+                readOnly: true

servers/legion/k8s/media/backup-external-secrets.yaml

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+# media-backup-credentials — R2 + restic credentials for nightly media config backup
+apiVersion: external-secrets.io/v1beta1
+kind: ExternalSecret
+metadata:
+  name: media-backup-credentials
+  namespace: media
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    name: vault
+    kind: ClusterSecretStore
+  target:
+    name: media-backup-credentials
+    creationPolicy: Owner
+    template:
+      data:
+        RESTIC_PASSWORD: "media-restic-2026"
+        AWS_ACCESS_KEY_ID: "{{ .r2_access_key_id }}"
+        AWS_SECRET_ACCESS_KEY: "{{ .r2_secret_access_key }}"
+        RESTIC_REPOSITORY: "s3:https://651161e0a3d321561b4c90b5bcd5f15b.r2.cloudflarestorage.com/legion-media-backup"
+  data:
+    - secretKey: r2_access_key_id
+      remoteRef:
+        key: secret/data/r2
+        property: access_key_id
+    - secretKey: r2_secret_access_key
+      remoteRef:
+        key: secret/data/r2
+        property: secret_access_key