add backup stack with borgmatic backup service

backup/docker-compose.override.yml

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+services:
+  borgmatic:
+    labels:
+      net.unraid.docker.managed: 'composeman'
+      net.unraid.docker.icon: 'https://cdn.jsdelivr.net/gh/selfhst/icons@main/png/borgmatic.png'
+      net.unraid.docker.webui: ''
+      net.unraid.docker.shell: ''

backup/docker-compose.yml

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+services:
+  borgmatic:
+    image: ghcr.io/borgmatic-collective/borgmatic:latest
+    container_name: borgmatic
+    volumes:
+      - /mnt/user/nextcloud-data/tonitrus/files/documents/Schule:/mnt/source:ro # backup source
+      - /mnt/remotes/10.0.0.50_home/Drive/backup-cube-test:/mnt/borg-repository # backup target
+      - /mnt/user/appdata/borgmatic/borgmatic.d:/etc/borgmatic.d/  # borgmatic config file(s) + crontab.txt
+      - /mnt/user/appdata/borgmatic/.config/borg:/root/.config/borg # config and keyfiles
+      - /mnt/user/appdata/borgmatic/.ssh:/root/.ssh # ssh key for remote repositories
+      - /mnt/user/appdata/borgmatic/.cache/borg:/root/.cache/borg # checksums used for deduplication
+      - /mnt/user/appdata/borgmatic/.state/borgmatic:/root/.local/state/borgmatic # Here are the state files for periodic checks
+    env_file:
+      - .env
+    labels:
+      net.unraid.docker.icon: "https://cdn.jsdelivr.net/gh/selfhst/icons@main/png/borgmatic.png"
+      net.unraid.docker.shell: sh
+      folder.view2: "Services"

backup/name

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+backup