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Migrating Amazon S3 Buckets to OneDrive for Business - petergrew - 10-08-2026 Hi everyone, I am currently exploring the process of migrating data from Amazon S3 buckets to OneDrive for Business and wanted to understand the best approaches, tools, and potential challenges involved. The goal is to move large volumes of files stored in Amazon S3 into OneDrive for Business while maintaining data integrity, security permissions, and an organized folder structure. Since S3 and OneDrive use different storage models, I am interested in learning how others have handled this type of migration successfully. Some areas I would appreciate guidance on: What migration tools or services work best for transferring data from Amazon S3 to OneDrive for Business? How do you handle large-scale migrations involving millions of files or multiple terabytes of data? Are there any limitations related to file size, metadata transfer, or folder hierarchy during migration? What is the best way to validate that all files have migrated correctly without data loss? How can organizations maintain security controls and access permissions after moving from AWS storage to Microsoft 365? Are there recommended steps for reducing downtime during the migration process? I have seen solutions involving Microsoft Migration Manager, third-party Amazon S3 migration software, and custom scripts using APIs, but I would like to hear from people who have completed similar migrations in real-world environments. Any recommendations, lessons learned, or migration checklists would be greatly appreciated. Thanks in advance!