Scheduled Backup for iOS & Android

I'm seeking a skilled developer to create a cross-platform (iPhone, Android, Windows, macOS) application that interfaces with QNAP servers for backup synchronization (through VPN). The app's primary focus will be managing media files such as photos, videos, music and documents.
This system should perform scheduled automatic backups, eliminating the need for manual intervention

Key Requirements:
- Both real-time and scheduled backups
- File management capabilities
- Media streaming options
- Backup synchronization features


Ideal Skills:
- Proficiency in mobile device management
- Cross-platform mobile app development (iOS & Android)
- Desktop app development (Windows & macOS)
- QNAP integration
- Expertise in media file management
- Experience with real-time and scheduled synchronization systems

This app is crucial for ensuring seamless media backup and management across devices. Please bid only if you have relevant experience and can deliver a high-quality product.