# backup-client

A containerized SSH backup server built on Alpine Linux, designed to provide secure remote backup access using SSH/SFTP protocols.

## Features

- 🔐 **Secure SSH Access**: Automated SSH server setup with configurable authentication
- 🐳 **Docker Ready**: Multi-architecture support (linux/amd64, linux/arm64)
- 📦 **BorgBackup Integration**: Built-in backup solution support
- ⚙️ **Dynamic Configuration**: Real-time SSH config monitoring and reloading
- 🔄 **CI/CD Pipeline**: Automated builds via Drone CI

## Quick Start

```bash
docker run -p 20022:20022 -v /backup/data:/home/backup safebox/backup-client
```

## Configuration
### Environment Variables

| Variable     | Default | Description                   |
|--------------|---------|-------------------------------|
| SSH_PORT     | 20022   | SSH server listening port     |
| SSH_USER     | backup  | Backup user name              |
| SSH_PASSWORD | backup  | User password for authentication |

## How it Works
The container automatically:

User Setup: Creates the backup user with configured credentials
SSH Configuration: Generates host keys (Ed25519) if not present
Server Start: Launches SSH daemon

## Key Components
Dockerfile: Alpine-based image with OpenSSH, su-exec, and BorgBackup
start_backup.sh: Main entrypoint script handling SSH setup 
.drone.yml: CI/CD pipeline for multi-architecture builds

Security Features
Host Key Persistence: SSH host keys are generated once and persisted
Configurable Authentication: Supports both password and public key authentication
User Isolation: Runs SSH daemon as non-root user

## Development

Development builds: Push to registry.dev.format.hu/backup-client
Release builds: Tag events push to safebox/backup-client on DockerHub
Multi-architecture: Supports both AMD64 and ARM64 platforms

## License
This project is open source. Please check the license file for details.