To be prepared for hardware or software failure on SAP ASE, perform frequent backups of all databases, and keep copies of system tables.
Perform frequent backups of the master database and all user databases. See System Administration Guide: Volume 2 > Restoring the System Databases.
Keep a copy (preferably offline) of these system tables: sysusages, sysdatabases, sysdevices, sysloginroles, and syslogins. If you have copies of these scripts, and a hard-disk failure or other disaster makes your database unusable, you can use the recovery procedures described in System Administration Guide: Volume 2 > Restoring the System Databases. If you do not have current copies of your scripts, it is much more difficult to recover SAP ASE when the master database is damaged.