mJai (7/7/2013)
When I try to copy these files (master,model,msdb,tempdb), it says the files is in use and it does not allow me to copy.
You don't need the TempDB files. Master and model are the ones that are useful to have file copies of, msdb just make sure you have good backups.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability