You could use a WINDOWS scheduled task calling a bcp out command with a trusted connection.
Regarding details for bcp please see BOL (BooksOnLine, the SQL Server help syste usually installed together with SQL Server).
Another option would be using a SQL Server job and xp_cmdshell but that should require additiona lsteps to avoid making xp_cmdshell available for every user (which would open a security hole of unknown depth).
A third solution would be a SSIS package called.
I, personally, would use either the first or the second option.