try to write

backup-dav.yml

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+version: '3.1'
+
+services:
+  backup-dav:
+    image: hurlenko/webdav:latest
+    restart: unless-stopped
+    environment:
+      - "WEBDAV_AUTH=false"
+    volumes:
+      - /backup:/webdav
+    labels:                     
+      - "traefik.enable=true"
+      - "traefik.http.middlewares.backup-server-stripprefix.stripprefix.prefixes=/backup"                      
+      - "traefik.http.services.backup-server.loadbalancer.server.port=80"
+      - "traefik.http.routers.backup-server.entrypoints=websecure"                                              
+      - "traefik.http.routers.backup-server.tls.certresolver=myresolver"                                        
+      - "traefik.http.routers.backup-server.rule=Host(`$DOMAIN`) && PathPrefix(`/backup`)"                     
+      - "traefik.http.routers.backup-server.middlewares=backup-server-stripprefix"                           
+    networks:                                                                                         
+      - chains
+    
+