Absolutely — here's a **safe, resource-friendly Docker image backup script** that:

✅ Loops through all your images  
✅ Uses `nice` + `ionice` to avoid system slowdowns  
✅ Saves each image as a `.tar` file  
✅ Logs progress and errors to a file  
✅ Allows optional target backup folder (like external drive)

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### 📝 Script: `docker_backup_all.sh`

```bash
#!/bin/bash

# Set your backup directory (default: current dir or pass as $1)
BACKUP_DIR="${1:-./docker-backups}"
LOG_FILE="$BACKUP_DIR/backup-log.txt"

mkdir -p "$BACKUP_DIR"
echo "Docker image backup started at $(date)" > "$LOG_FILE"

# Get list of images in format: repository:tag
images=$(docker images --format '{{.Repository}}:{{.Tag}}')

for image in $images; do
    # Create a safe file name
    safe_name=$(echo $image | tr '/:' '_')
    output_file="$BACKUP_DIR/${safe_name}.tar"

    echo "Backing up $image -> $output_file"
    echo "$(date) - Saving $image as $output_file" >> "$LOG_FILE"

    # Run with low resource priority
    if ionice -c2 -n7 nice -n19 docker save -o "$output_file" "$image" >> "$LOG_FILE" 2>&1; then
        echo "✅ $image saved successfully"
    else
        echo "❌ Failed to save $image" | tee -a "$LOG_FILE"
    fi
done

echo "Backup complete at $(date)" >> "$LOG_FILE"
echo "✔️ All done! Backup saved in: $BACKUP_DIR"
```

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### 🔧 How to Use

1. Save it as `docker_backup_all.sh`
2. Make it executable:

```bash
chmod +x docker_backup_all.sh
```

3. Run it (optionally pass your external folder):

```bash
./docker_backup_all.sh /media/harish/E-drive/docker-backups
```

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### 🔐 Pro Tips

- Run as root or with `sudo` if needed.
- You can add a cron job to run this weekly/monthly.
- Works great even on low-resource machines.

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Want me to add support for compressing the `.tar` files (`.tar.gz`) to save space? Or add a restore script too?