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Data Online Migration:Background information

Last Updated:Feb 12, 2026

This tutorial describes how to migrate data from an Amazon Simple Storage Service (Amazon S3) bucket to an Alibaba Cloud Object Storage Service (OSS) bucket.

To migrate data from an Amazon S3 bucket to an Alibaba Cloud OSS bucket over an Express Connect circuit, see Overview.

Overview

The Alibaba Cloud Online Migration Service is a data transport service that helps you migrate data to OSS from third-party sources or between OSS buckets.

To use the Online Migration Service, enter the source and destination addresses in the console to create a migration task. Once the task starts, you can manage it, monitor its progress, and view traffic information from the console.

How it works

Migration process

The migration process is shown in the following figure:Migration process diagram

  • For data security and consistency, we recommend using HTTPS.

  • After a migration task is complete, you must verify data consistency between the source and destination.

Warning

Always verify the destination data after the migration is complete. Deleting source data before verification may result in permanent data loss, for which you are solely responsible.

Workflow for creating a migration task

The workflow for creating a migration task is shown in the following figure:Create a migration task

Important

During migration, data is read from the source data address. The source storage provider charges outbound Internet traffic fees for this transfer.

In this tutorial

This tutorial includes the following sections: