I've seen this page, however the problem with this utility is that it does not allow me to configure the rotation of backups. For example, I could create a weekly cron to send my backup via FTP using this utility ... ok!
But I could not put something in the command that simply tells Plesk "The number of maximum allowed backups on this FTP account is 4. If you have 4 backups, delete the oldest backup and create a new one to replace it." I may be wrong, but is this option available?