S3cmd provides the object copy command to create a copy for an existing object on OBS.
s3cmd cp s3://my-bucket-1/object s3://my-bucket-2
It is a good practice to copy an object to different buckets or folders. An object name must be unique in a bucket. If the source object's path is the same as the copy's path, the object's copy fails to be created.
s3cmd cp s3://my-bucket-1/object s3://my-bucket-2/object-copy
s3cmd ls s3://my-bucket-2