Here is a drush command (drush s3fs-copy-local) and a button on s3fs module's config page (admin/config/media/s3fs/actions "copy local public files to s3") to send all localy stored file to s3 bucket.
But... What about if I want to stop using s3fs? Files uploaded after I turned on s3fs public file storage are doesn't stored in local file system. How can I copy all files stored on s3 bucket to local fs? Okay I can do it manually but it would be very useful a drush command or function to copy all files from s3 bucket to local file system.
Closed: outdated
2.0
Code
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Drupal 7 end-of-life triage:
Drupal 7 will reach end of life on January 5th.
The 7.x branches of S3FS do not have any additional planned releases.
The 4.x branches are undergoing a redesign, with the indent to move file migration to an external module that will be streamWrapper agnostic. This feature will be provided either by Bulk File Management → or another contrib module.