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Explore the complexities of file storage for web applications in this 39-minute conference talk from EuroPython 2015. Delve into the challenges faced by projects when transitioning to cloud deployment or migrating infrastructure. Learn about DEPOT, a file storage framework designed to address these issues while providing a user-friendly interface for developers. Discover how to implement attachments with SQLAlchemy or MongoDB using DEPOT, and understand strategies for handling storage backend migrations and long-term evolution. Gain insights into the flexibility of DEPOT, which allows for seamless switching between different storage options without code modifications, similar to SQLAlchemy's database abstraction capabilities.