Data Saving

Dear All,

I am new to SAP enviroment.I am learning APO .How to save

created data as BACKUP in DP or SNP etc like Planning Book,Planning Area,Master or transactional data,so that if suppose Hard Disk or Software will get currupted we can retirive the same data from the back up.What is the procedure.

Many thanks for your kind support in advance.

Regards,

Vishwesh Rajguru