怎么样用asp代码在本地备份服务器上的sql server数据库

SQL="backup database 数据库名 to disk=’"&Server.MapPath("backup")&"\"&"backuptext.dat"&"’"
set cnn=Server.createobject("adodb.connection")
cnn.open "driver={SQL Server};Server=服务器名;uid=sa;pwd="
cnn.execute SQL
on error resume next
if err<>0 then
response.write "错误："&err.Descripting
else
response.write "数据备份成功！"
end if