But I am running this command with sa user.....
Wich kind of permission is missing to execute this copy?
When I execute the same command to copy the backup from the server to itself, it works fine!!!!
Does someone have an idea to solve this problem?????
The NT login being used by SQL Server is probably (local system). When xp_cmdshell runs, it uses the login that is used for SQL Server. The (local system) NT login has no permissions on other machines, it is a purely local login.
If this is your problem, you'll need to give some thought to how you want to fix it. The simplest answer is to change the NT login used by SQL Server, then restart the SQL Service.