to replicate one s3 drive to another, one of the easiest and best way is to use s3md command.
To instal this command use –
apt-get install s3cmd
after installation, run the following command to setup s3cmd. this will also ask for your access and secret keys
then run the following command to create a new backup bucket and replicate from existing one.
s3cmd mb s3://mybucket_backup
s3cmd –recursive cp s3://mybucket s3://mybucket_backup