To accomplish what you want, you'd have to backup to a local drive daily in WHM > Backup > Configure Backups area.
After getting the daily backups, you'd then have to add a cron script that would ftp or a cron command to scp the contents of the backups weekly to your remote FTP machine. Since daily backups also creates a weekly folder, you could simply copy that weekly folder.
That is the only way I really see it working the way you are wanting it to work.
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