#!/bin/bash
# backup_daily.sh - Daily backup script using restic to Backblaze B2

set -euo pipefail

# Configuration
export B2_ACCOUNT_ID="your_b2_account_id"
export B2_ACCOUNT_KEY="your_b2_account_key"
export RESTIC_REPOSITORY="b2:your-bucket-name:/backups"
export RESTIC_PASSWORD="your_restic_password"

# Backup targets
BACKUP_DIRS=(
  "/var/lib/docker/volumes/homeassistant/_data"
  "/var/lib/docker/volumes/portainer/_data"
  "/var/lib/docker/volumes/nextcloud/_data"
  "/mnt/nas/models"
)

# Logging
LOG_FILE="/var/log/restic_backup.log"
exec > >(tee -a "$LOG_FILE") 2>&1

echo "=== Restic Backup Started at $(date) ==="

# Check if repository is initialized
if ! restic snapshots &>/dev/null; then
  echo "Repository not initialized. Initializing..."
  restic init
fi

# Perform backup
echo "Backing up directories: ${BACKUP_DIRS[*]}"
restic backup "${BACKUP_DIRS[@]}" \
  --tag homelab \
  --verbose

# Prune old backups (keep last 7 daily, 4 weekly, 12 monthly)
echo "Pruning old backups..."
restic forget \
  --keep-daily 7 \
  --keep-weekly 4 \
  --keep-monthly 12 \
  --prune

# Check repository integrity (monthly)
DAY_OF_MONTH=$(date +%d)
if [ "$DAY_OF_MONTH" == "01" ]; then
  echo "Running repository check..."
  restic check
fi

echo "=== Restic Backup Completed at $(date) ==="