i think there may be a problem with the s3 compatibility?
is the instance you are restoring to up-to-date with Discourse latest version?
i think there is a problem here
/var/www/discourse/lib/file_store/to_s3_migration.rb
maybe with the payload being sent to put_object at line 216
i’m not sure what the full solution is, but i think to get it working you may need to disable S3 (enable_s3_uploads: false) and do the restore and extract locally. then re-enable s3 use rake uploads:migrate_to_s3 command?