This article will explain how to configure FTP backups in Plesk.
Login to your Plesk panel.
Click on the Tools & Settings option under Server Management.
Click on Backup Manager under the Tools & Resources section.
Click on Personal FTP Repository Settings.
Enter the FTP details of the server you wish to backup to and select to use Passive Mode. Then click the OK button.
Go back to the Backup Manager and click on Scheduled Backup Settings.
Configure the options to your backup requirements.
Click the OK button to complete the configuration.