add backup image

images/backup/Dockerfile

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+FROM alpine/git:latest
+# or a more specific image like a Debian slim or Ubuntu base image.
+RUN apk add --no-cache restic fuse-overlayfs
+WORKDIR /app
+
+COPY backup.sh /app/backup.sh
+COPY cleanup.sh /app/cleanup.sh
+
+# Make scripts executable
+RUN chmod +x /app/backup.sh /app/cleanup.sh

images/backup/backup.sh

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+#!/bin/sh
+
+set -e
+
+if [ -z "$RESTIC_PASSWORD" ]; then
+  echo "Error: RESTIC_PASSWORD environment variable is not set." >&2
+  exit 1
+fi
+
+RESTIC_REPOSITORY="/mnt/backup"
+SOURCE_DIR="/mnt/source"
+
+mkdir -p "$SOURCE_DIR"
+mkdir -p "/mnt/backup"
+
+echo "Starting Restic backup from $SOURCE_DIR to $RESTIC_REPOSITORY"
+
+echo "Checking/Initializing Restic repository..."
+restic init --repository "$RESTIC_REPOSITORY" || true
+
+echo "Running Restic backup..."
+restic backup \
+  "$SOURCE_DIR" \
+  --verbose \
+  --tag "daily" \
+  --exclude-cache \
+
+if [ $? -eq 0 ]; then
+  echo "Restic backup completed successfully!"
+else
+  echo "Restic backup failed!"
+  exit 1
+fi
+
+echo "Backup finished."

images/backup/cleanup.sh

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+#!/bin/sh
+
+set -e
+
+if [ -z "$RESTIC_PASSWORD" ]; then
+  echo "Error: RESTIC_PASSWORD environment variable is not set." >&2
+  exit 1
+fi
+RESTIC_REPOSITORY="/mnt/backup"
+
+echo "Starting Restic cleanup for repository $RESTIC_REPOSITORY"
+
+echo "Checking Restic repository existence..."
+restic snapshots --repository "$RESTIC_REPOSITORY"
+
+# Restic forget and prune strategy
+# --keep-daily 7: Keep 7 most recent daily backups
+# --keep-weekly 4: Keep 4 most recent weekly backups
+# --keep-monthly 6: Keep 6 most recent monthly backups
+# --keep-yearly 1: Keep 1 most recent yearly backup
+# --prune: Actually delete data that's no longer referenced
+# --group-by host,paths: Group snapshots for retention by host and path.
+echo "Running Restic forget and prune..."
+restic forget \
+  --group-by host,paths \
+  --tag "daily" \
+  --keep-daily 7 \
+  --keep-weekly 4 \
+  --keep-monthly 6 \
+  --keep-yearly 1 \
+  --prune \
+  --verbose \
+  --repository "$RESTIC_REPOSITORY"
+
+if [ $? -eq 0 ]; then
+  echo "Restic cleanup completed successfully!"
+else
+  echo "Restic cleanup failed!"
+  exit 1
+fi
+
+echo "Cleanup finished."