Dumping the data from PRD to QAS

Hi Experts,

Please give suggestions on How to copy all the data from Production to QAS. Which is the best way to copy like client copy,client export ,client import or restore the database by using restore command.We are using ECC 6.0 EHP 7 ,SyBase DB with WINDOWS 2012.

Regards,

Patan Thavaheer.