## ADDED Requirements

### Requirement: Docker image builds successfully
The Docker image SHALL build without errors from the project root using `docker build`.

#### Scenario: Build from project root
- **WHEN** developer runs `docker build -t backup-tool .`
- **THEN** the image builds successfully with all dependencies installed

### Requirement: Docker Compose orchestrates full stack
The `docker-compose.yml` SHALL start both backend and frontend services with a single command.

#### Scenario: Start full stack
- **WHEN** developer runs `docker compose up`
- **THEN** backend API is accessible on port 8000
- **AND** frontend is accessible on port 3000
- **AND** services can communicate with each other

### Requirement: Development mode supports hot reload
The Docker setup SHALL support development mode with file watching and automatic reloading.

#### Scenario: Backend code changes trigger reload
- **WHEN** developer modifies a Python file in development mode
- **THEN** the backend service restarts automatically
- **AND** changes are reflected without manual container rebuild

### Requirement: Production mode uses optimized build
The production Docker setup SHALL use multi-stage builds and serve static files efficiently.

#### Scenario: Production deployment
- **WHEN** developer runs `docker compose -f docker-compose.yml up` in production configuration
- **THEN** frontend assets are built and served by the backend
- **AND** no development servers are running
- **AND** image size is minimized

### Requirement: Data persistence across restarts
The Docker setup SHALL preserve SQLite database and backup files across container restarts.

#### Scenario: Container restart preserves data
- **WHEN** docker containers are stopped and restarted
- **THEN** all existing backups and job history are preserved
- **AND** no data loss occurs