See this link for thread in DA forum: forum.directadmin.com/threads/ftp-ftps.55793/post-356590
Here you can choose between ftp and ftps: 2222/admin/backups/scheduled
Here you can choose between ftp and scp: 2222/admin/system-backup/remote
Please add a ftps option.
I only use an ftp server for backup. Because I can not choose for ftps in 2222/admin/system-backup/remote, all my backups must be in insecure ftp!
That is because when I configure my local FTP server for ftps, it won't accept ftp and vice versa.