Follow these steps to generate a cPanel backup and send it to the FTP server:

1. Log in to your cPanel account.
For instructions on how to log in to your cPanel account, please click here.

2. Under the Files section, click Backup.

3. Click the Back Up button.

4. Click the Full Backup button.

5. In the Backup Destination dropdown menu, select Remote FTP Server. In the Email Address field, enter your email address.

6. Complete the form with the FTP details of the server to which you wish to send the backup file.

Remote Server: FTP IP address or FTP domain name, such as "ftp.example.com".
Remote User: Your FTP username.
Remote Password: Your FTP password.
Port: 21 or another FTP port.
Remote Dir: Remote directory, i.e. "/home/username/backupfolder/".

7. Once completed, click the Generate Backup button.