Sybase SQL anywhere database backup

Dear Expets,

I am using BI 4.1 sp1 BOBJ server under sybase SQL anywhere 12 database and Operating system is Windows 2008 server.

I want to take offline and online backup of database , How to take from both command line and from admin console ( please guide me step by step procedure I am first time using SQL aynwhere database).

second My SQl server database consist 4 files

1. BI4_Aduit.db Size of this file is 1025 MB

2. BI4_Audit.log Size of this file is 924 MB

3. BI4_CMS.db Size of this file is 47 MB

4. BI4_CMS.log Size of this file is 3.4 GB

why BI4_CMS.log size too much how to reduce the CMS log file size

Regards