Mobile Photo Backup App with USB Drive Integration

The Challenge

Users needed a reliable way to back up photos from their phones without relying on cloud services or requiring internet connectivity. The solution needed to work with USB drives connected via USB-C or micro-USB adapters, handle large photo libraries efficiently, and provide a simple user experience. The challenge was building a mobile app that could interface with external USB storage devices reliably across different Android versions and hardware configurations.

Our Approach

• Developed native Android application with USB OTG (On-The-Go) support
• Built USB device detection and file system access layer for various USB drive formats
• Implemented efficient photo scanning and indexing system for large photo libraries
• Created background backup service with progress tracking and error handling
• Designed user interface for selecting photos, choosing backup location, and monitoring progress
• Built duplicate detection and incremental backup system to avoid redundant transfers
• Implemented file integrity verification and resume capability for interrupted backups
• Added support for multiple photo formats and metadata preservation

Results

• Enabled reliable offline photo backup without cloud dependency
• Supported various USB drive formats and Android devices
• Handled large photo libraries efficiently with background processing
• Provided user-friendly interface for backup management
• Added file integrity checks and resume behavior for interrupted transfers

Technology Stack