There may be a situation where you do not have a zip utility on Amazon server so, the backup files under a domain has to be downloaded one by one but this a pretty long procedure and you want to avoid it by executing a single command.
In order to get backup recursively from Amazon server use this command -
s3cmd get --recursive s3://Bucket/Backup/Server-x.x.x.x/Backup/account_name/ /Amazon
Where
1. S3cmd is a tool for managing objects in Amazon S3 storage.
2. Bucket/Backup/Server-x.x.x.x/Backup/account_name/ is the backup directory.
3. /Amazon is the folder on your server where you want to get the backup.