Hi
Kindly follow the SAP Notes and system copy guide
Note 1476928 - System copy of SAP systems on Windows 2008 (R2): SQL Server
Note 965908 - SQL Server Database Mirroring and SAP Applications
Note 1152240 - Setting Up Microsoft SQL Server 2008 (R2)
System copy guide https://service.sap.com/instguidesNW70 base on your version
Thanks
Ram