第一步，用 sp_who2 查出备份的sid（或在窗口中的连接属性中看）
exec sp_who2
第二步，用以下查询获得运行情况（看 percent_complete列）
SELECT session_id, request_id, start_time, status, command, sql_handle , database_id, user_id , blocking_session_id , wait_type, wait_time, last_wait_type, wait_resource, open_transaction_count, open_resultset_count, transaction_id , percent_complete, estimated_completion_time, cpu_time, total_elapsed_time, scheduler_id , reads, writes, logical_reads FROM sys.dm_exec_requests WHERE session_id=94
