# OpenBSD Server Backup Script

A robust, production-ready backup solution for OpenBSD servers that compresses directories and uploads them to cloud storage with comprehensive logging and email notifications.

## Author

**Biswa Kalyan Bhuyan**  
📧 [biswa@surgot.in](mailto:biswa@surgot.in)

## Features

- ✅ **Individual tar archives** for each directory
- ✅ **Maximum gzip compression** (level 9) 
- ✅ **Cloud upload** via rclone
- ✅ **Automatic cleanup** after successful upload
- ✅ **Email notifications** with detailed logs
- ✅ **Directory validation** before backup
- ✅ **Disk space checking** (1GB minimum requirement)
- ✅ **Log rotation** (keeps last 10 logs)
- ✅ **Permission validation** with root privilege warnings
- ✅ **Dry-run mode** for testing
- ✅ **Server-optimized** with production-ready configurations

## Requirements

### System Requirements
- **OpenBSD** (tested and optimized for OpenBSD)
- **Root access** (recommended for complete system backups)
- **Minimum 1GB free space** in `/tmp`

### Dependencies
```bash
# Install required packages
pkg_add rclone mailx

# Configure rclone (setup 'cf' remote)
rclone config
```

## Installation

### 1. Clone Repository
```bash
git clone <repository-url>
cd openbsd-backup-script
```

### 2. Deploy to Server
```bash
# Copy script to system location
sudo cp backup.sh /usr/local/bin/
sudo chmod +x /usr/local/bin/backup.sh
sudo chown root:wheel /usr/local/bin/backup.sh
```

### 3. Configure
- Setup rclone remote named 'cf' pointing to your cloud storage
- Verify email functionality: `echo "Test" | mail -s "Test" root@mail.surgot.in`
- Edit script to change `EMAIL_RECIPIENT` if needed

## Usage

### Basic Commands

```bash
# Test mode (no actual upload)
sudo backup.sh --dir /etc --dry-run

# Backup single directory
sudo backup.sh --dir /etc

# Backup multiple directories  
sudo backup.sh --dir /etc,/var/www,/var/log

# Process existing tarball
sudo backup.sh /path/to/existing.tar

# Show help
backup.sh --help
```

### Server-Specific Examples

#### Web Server Backup
```bash
sudo backup.sh --dir /etc,/var/www,/var/log
```

#### Mail Server Backup
```bash
sudo backup.sh --dir /etc,/var/mail,/var/spool/mail,/usr/local/etc
```

#### Database Server Backup
```bash
sudo backup.sh --dir /etc,/var/lib/mysql,/var/postgresql,/usr/local/etc
```

#### Complete System Backup
```bash
sudo backup.sh --dir /etc,/var/www,/var/log,/home,/usr/local,/var/mail
```

## Automation with Cron

### Daily Backup (2:00 AM)
```bash
# Edit root's crontab
sudo crontab -e

# Add daily backup
0 2 * * * /usr/local/bin/backup.sh --dir /etc,/var/www,/var/log >/dev/null 2>&1
```

### Weekly Full Backup (Sunday 3:00 AM)
```bash
# Weekly comprehensive backup
0 3 * * 0 /usr/local/bin/backup.sh --dir /etc,/var/www,/var/log,/home,/usr/local/etc >/dev/null 2>&1
```

### Multiple Schedules
```bash
# Daily configs (2 AM)
0 2 * * * /usr/local/bin/backup.sh --dir /etc,/usr/local/etc >/dev/null 2>&1

# Daily web content (3 AM)  
0 3 * * * /usr/local/bin/backup.sh --dir /var/www >/dev/null 2>&1

# Weekly logs (Sunday 4 AM)
0 4 * * 0 /usr/local/bin/backup.sh --dir /var/log >/dev/null 2>&1
```

## Configuration

### Script Configuration
Edit these variables in `backup.sh`:
```bash
RCLONE_REMOTE="cf:backups/"              # Cloud storage remote
EMAIL_RECIPIENT="root@mail.surgot.in"    # Email for notifications
COMPRESSION_LEVEL=9                       # Gzip compression level
MIN_FREE_SPACE_MB=1024                   # Minimum required space (MB)
MAX_LOG_FILES=10                         # Log retention count
```

### File Naming Convention
- **Archive files**: `etc-20250606.tar.gz`, `var-www-20250606.tar.gz`
- **Log files**: `/var/log/backup-log-20250606.log`
- **Backup staging**: `/tmp/backups-20250606/`

## Monitoring & Logs

### Log Locations
- **Primary**: `/var/log/backup-log-YYYYMMDD.log`
- **Fallback**: `/tmp/backup-log-YYYYMMDD.log` (if `/var/log/` not writable)

### Email Reports
- **Success**: `[SUCCESS] Backup Script Log - hostname - date`
- **Failure**: `[FAILED] Backup Script Log - hostname - date`
- **Content**: Complete execution log with statistics

### Log Rotation
- Automatically keeps last 10 log files
- Older logs are automatically removed

## Output Examples

### Archive Creation
```
[INFO] Creating tar archive for: /var/www
[INFO] Directory size: 486M
[INFO] Available space in backup location: 5229 MB
[INFO] Creating archive: /tmp/backups-20250606/var-www-20250606.tar
[SUCCESS] Tar archive created in 3 seconds
[INFO] Archive size: 484 MB
```

### Compression & Upload
```
[INFO] Compressing 'var-www-20250606.tar' with maximum compression (level 9)...
[SUCCESS] Compression completed in 45 seconds
[INFO] Original size: 484 MB
[INFO] Compressed size: 156 MB
[INFO] Compression ratio: 67%
[INFO] Space saved: 328 MB
[INFO] Uploading 'var-www-20250606.tar.gz' to cf:backups/...
[SUCCESS] Upload completed successfully in 23 seconds
```

## Error Handling

### Common Issues & Solutions

#### Permission Denied
```bash
# Run as root for system directories
sudo backup.sh --dir /etc
```

#### Insufficient Disk Space
```bash
# Check available space
df -h /tmp
# Clean up old files or increase disk space
```

#### Directory Not Found
```bash
# Script validates directories before starting
[ERROR] Directory does not exist: /var/www
```

#### rclone Not Configured
```bash
# Configure rclone remote
sudo rclone config
# Setup remote named 'cf'
```

## Security Considerations

- **Run as root** for complete system access
- **Sensitive files** (like `/etc/shadow`) may show permission warnings (normal behavior)
- **Cloud credentials** stored in rclone config
- **Log files** contain backup statistics but not file contents
- **Email logs** sent to configured recipient

## Performance

### Typical Performance
- **Compression**: ~10-15MB/s (depends on data type and CPU)
- **Upload**: Depends on network bandwidth and cloud provider
- **Disk Usage**: Temporary files in `/tmp/` (auto-cleaned)

### Optimization Tips
- **Schedule during off-peak hours** (2-4 AM)
- **Separate large directories** into different backup jobs
- **Monitor disk space** in `/tmp/`
- **Use SSD storage** for better compression performance

## Contributing

1. Fork the repository
2. Create a feature branch (`git checkout -b feature/amazing-feature`)
3. Commit your changes (`git commit -m 'Add amazing feature'`)
4. Push to the branch (`git push origin feature/amazing-feature`)
5. Open a Pull Request

## License

This project is open source and available under the [BSD License](LICENSE).

## Support

For issues, questions, or contributions:
- **Email**: [biswa@surgot.in](mailto:biswa@surgot.in)
- **Issues**: Use my email for bug reports and feature requests

## Changelog

### v1.0.0
- Initial release
- OpenBSD optimized backup script
- Cloud upload via rclone
- Email notifications
- Comprehensive logging
- Directory validation
- Dry-run mode
- Automatic cleanup
- Log rotation

---

**Made with ❤️ for OpenBSD servers**