Use the dump database command to back up your databases. If you encounter any problems during the upgrade, you may need these dumps to recover the previous installation. Be sure to dump the master database.
WARNING! The upgrade process permanently modifies your existing Sybase databases. Back up all your databases, including master, sybsystemprocs, and model before beginning the upgrade so you can restore them if necessary.
For information on backing up and recovering databases, see the System Administration Guide.