Backup command can not find in CB4.1.0

I am using Couchbase Server Version: 4.1.0-5005 Enterprise Edition (build-5005) on Ubuntu 12.04.5 LTS (GNU/Linux 3.2.0-90-generic x86_64)

and as Enterprise Backup and Restore Tool says,we can use this backup command to backup and restore bucket.

./backup create --dir [directory-name] --name [repository-name] --host [hostname] \
        --username [admin] --password [password]

but I can not find backup command under /opt/couchbase directory.

This is a new command in Couchbase 4.5 DP. It was renamed to cbbackupmgr in Couchbase 4.5 Beta and will remain named cbbackupmgr moving forward.