Hi,
a good starting point might be the following discussion:
https://scn.sap.com/thread/3173659
Setting up the backup via DBA Cockpit is explained there.
It is also possible to create a shell / sql script on operating system level and call this via cron (or any other scheduler). The sql in this discussion (ASE Restore database from transactional LOG backup.) could be used as a basis.
Btw: If you backup your database twice a day, there could be a worst case of 12 hours data loss. You should also think about transaction log backups. As these backups contain changes since the last backup only, their file size is not very large. So usually it makes sense to trigger a transaction log dump every 10 or 15 minutes. This reduces the maximum data loss to that period of time. If you want to decrease this, you have to think about high availibility solutions (keyword: HADR).
Best regards,
Juergen