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sqlserver2008开始提供压缩备份，好处是备份与还原时间缩短，备份文件也很小，测试结果显示文件小了2/3,不过不好的地方在于CPU要大量计算，CPU要占不少资源，不过若放在晚上执行的话，cpu可以忽略。
SELECT name,backup_start_date,backup_finish_date,compressed_backup_size
FROM msdb..backupset;