Enable Chaining makes large migrations more stable by:
- Breaking data into manageable batch chunks
- Automatically running the next batch when one finishes
- Reducing manual effort
- Preventing timeouts during large migrations

PS: View Drag, Drop & Upload Files to Amazon S3, a Salesforce AppExchange app for moving files from Salesforce to Amazon S3: https://appexchange.salesforce.com/appxListingDetail?listingId=a0N3000000B5ZPqEAN