Building an iCloud alternative for personal use is a challenging but rewarding project. Here are some key steps and considerations:

1. **Hardware**: You'll need a reliable server setup. This could be a dedicated server or a powerful NAS (Network Attached Storage) device. Ensure you have sufficient storage, processing power, and a stable internet connection.

2. **Software**:
   - **Operating System**: A Linux distribution like Ubuntu Server is a popular choice for home servers.
   - **Cloud Software**: Nextcloud is a robust, open-source solution that offers file storage, calendar, contacts, and more.
   - **Backup Solutions**: Implement regular backup solutions to prevent data loss.

3. **Security**:
   - **Firewall**: Protect your network with a firewall.
   - **Encryption**: Use encryption for data at rest and in transit.
   - **Authentication**: Implement strong authentication mechanisms, like two-factor authentication.

4. **AI Training**:
   - **Face Recognition**: Open-source libraries like OpenCV or frameworks like TensorFlow can be used for training AI models on facial recognition.
   - **Data Processing**: Ensure you have the computational resources to handle AI training, which can be resource-intensive.

5. **Maintenance**: Regularly update your software to patch security vulnerabilities and improve performance.

6. **Legal and Ethical Considerations**: Be mindful of privacy laws and ethical considerations when handling personal data.

While it's a significant undertaking, many people find it worthwhile for the control and privacy it offers. There are numerous online communities and resources that can provide guidance and support throughout the process.