An electronic file migration system that analyzes data and migrate qualifying files from a source file system to another or cloud file system. The system can infer access times of the files from create and modify times. The system copies “qualifying” (e.g. aged under a probationary period) files from a source file system to a cloud file system or other storage system, and substitutes them with symbolic links or stubs to the target copies. The system may provide seamlessly-automated and interoperable data archiving, backups, transfers, analytics, and optimizations in an organization. In addition, it may also be desirable to devise a novel electronic file migration system for a third-party service provider to seamlessly process, manage, optimize, and analyze data archiving, backups, and transfers in a client organization.