Use duplicati to backup nextcloud's data storage.

backup/docker-compose.yaml

@@ -0,0 +1,33 @@
+version: "3.9"
+
+networks:
+  proxy:
+    external: true
+
+volumes:
+  duplicati-conf:
+    name: duplicati-conf
+  nextcloud-data:
+    external: true
+
+services:
+  duplicati:
+    image: duplicati/duplicati
+    restart: unless-stopped
+    container_name: duplicati
+    hostname: duplicati
+    ports:
+      - "8200:8200"
+    volumes:
+      - duplicati-conf:/data
+      - nextcloud-data:/nextcloud:ro
+      - /media/backup/nextcloud:/backup
+    networks:
+      - proxy
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.duplicati.entrypoints=web"
+      - "traefik.http.routers.duplicati.rule=Host(`duplicati.lan`)"
+      - "traefik.http.services.duplicati.loadbalancer.server.port=8200"
+
+