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Storage Transfer Service can listen to event notifications in AWS or Google Cloud
to automatically transfer data that has been added or updated in the source
location. Event-driven transfers are supported from AWS S3 or Cloud Storage,
and always use a Cloud Storage bucket as the destination.
Event-driven transfers listen to Amazon S3 Event Notifications
sent to Amazon SQS for AWS S3 sources. Cloud Storage sources send
notifications to a Pub/Sub subscription.
Benefits of event-driven transfers
Because event-driven transfers listen for changes to the source bucket, updates
are copied to the destination in near-real time. Storage Transfer Service doesn't need
to execute a list operation against the source, saving time and money.
Use cases include:
Event-driven analytics: Replicate data from AWS to Cloud Storage to
perform analytics and processing.
Event-driven transfers with Storage Transfer Service differ from
typical Cloud Storage replication by creating
a copy of your data in a different bucket.
This provides benefits such as:
Keeping development and production data in separate namespaces.
Sharing data without providing access to the original bucket.
Backing up to a different continent, or to an area not covered by
dual-region and multi-region storage.
DR/HA setup: Replicate objects from source to backup destination in order
of minutes:
Cross-cloud backup: Create a copy of AWS S3 backup on Cloud Storage.
Cross-region or cross-project backup: Create a copy of Cloud Storage
bucket in a different region or project.
Live migration: Event-driven transfer can power low-downtime migration, on
the order of minutes of downtime, as a follow up step to one-time batch
migration.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-07 UTC."],[],[],null,["# Event-driven transfers\n\nStorage Transfer Service can listen to event notifications in AWS or Google Cloud\nto automatically transfer data that has been added or updated in the source\nlocation. Event-driven transfers are supported from AWS S3 or Cloud Storage,\nand always use a Cloud Storage bucket as the destination.\n\nEvent-driven transfers listen to [Amazon S3 Event Notifications](https://docs.aws.amazon.com/AmazonS3/latest/userguide/NotificationHowTo.html)\nsent to Amazon SQS for AWS S3 sources. Cloud Storage sources send\nnotifications to a Pub/Sub subscription.\n\nBenefits of event-driven transfers\n----------------------------------\n\nBecause event-driven transfers listen for changes to the source bucket, updates\nare copied to the destination in near-real time. Storage Transfer Service doesn't need\nto execute a list operation against the source, saving time and money.\n\nUse cases include:\n\n- **Event-driven analytics**: Replicate data from AWS to Cloud Storage to\n perform analytics and processing.\n\n- **Cloud Storage replication**: Enable automatic, asynchronous object\n replication between Cloud Storage buckets.\n\n Event-driven transfers with Storage Transfer Service differ from\n [typical Cloud Storage replication](/storage/docs/availability-durability#cross-region-redundancy) by creating\n a copy of your data in a different bucket.\n\n This provides benefits such as:\n - Keeping development and production data in separate namespaces.\n - Sharing data without providing access to the original bucket.\n - Backing up to a different continent, or to an area not covered by dual-region and multi-region storage.\n- **DR/HA setup**: Replicate objects from source to backup destination in order\n of minutes:\n\n - Cross-cloud backup: Create a copy of AWS S3 backup on Cloud Storage.\n - Cross-region or cross-project backup: Create a copy of Cloud Storage bucket in a different region or project.\n- **Live migration**: Event-driven transfer can power low-downtime migration, on\n the order of minutes of downtime, as a follow up step to one-time batch\n migration.\n\nLearn how\n---------\n\n- [Set up event-driven transfers from Cloud Storage](/storage-transfer/docs/event-driven-google).\n- [Set up event-driven transfers from AWS S3](/storage-transfer/docs/event-driven-aws)."]]
