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在backup operation 中，必须控制好 Init，NoSkip 和 Format 三个选项。
1，在做Full backup时，使用 Format Option 创建新的Media Set
Format选项和NoSkip选项，NoInit选项是冲突的，在使用Format选项时，必须和 Skip， Init选项搭配。
Option ‘format‘ conflicts with option(s) ‘noskip‘.
Option ‘format‘ conflicts with option(s) ‘noinit‘.
--创建Media Set BACKUP DATABASE [TestSite] TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak1.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak2.bak‘ MIRROR TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak3.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak4.bak‘ WITH --backup set options Compression ,DESCRIPTION =N‘descr-site‘ ,NAME =N‘name-site‘ --,RETAINDAYS =28 --,EXPIREDATE=N‘2016-07-12 11:35:54.220‘ --Media set options ,INIT ,SKIP ,FORMAT ,MediaDescription=N‘Mdiea Descr‘ ,MEDIANAME = ‘Meida_name‘;
使用Format Option 时，Backup 将已存的media set 格式化，新建一个media set，并删除所有的backup set，然后创建一个新的 full backup。
在原有的backup devices上创建相应的Differential backup，必须使用Differential，NoInit，NoFormat 选项，NOSKIP 或 SKIP 都行。
--创建differential backup BACKUP DATABASE [TestSite] TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak1.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak2.bak‘ MIRROR TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak3.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak4.bak‘ WITH --backup set options Compression ,DESCRIPTION =N‘descr-site‘ ,NAME =N‘name-site‘ --,RETAINDAYS =28 --,EXPIREDATE=N‘2016-07-12 11:35:54.220‘ --Media set options ,NOINIT ,SKIP --NOSKIP ,NOFORMAT ,MediaDescription=N‘Mdiea Descr‘ ,MEDIANAME = ‘Meida_name‘ ,DIFFERENTIAL ;
2，在做Differential backup时，使用 Format Option 创建新的Differential backup
--创建Media Set BACKUP DATABASE [TestSite] TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak1.dif‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak2.dif‘ MIRROR TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak3.dif‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak4.dif‘ WITH --backup set options Compression ,DESCRIPTION =N‘descr-site‘ ,NAME =N‘name-site‘ --,RETAINDAYS =28 --,EXPIREDATE=N‘2016-07-12 11:35:54.220‘ --Media set options ,INIT ,SKIP ,FORMAT ,MediaDescription=N‘Mdiea Descr‘ ,MEDIANAME = ‘Meida_name‘ ,DIFFERENTIAL ;
3，在做Full Backup时，不格式化Media，而是初始化 backup set
BACKUP DATABASE [TestSite] TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak1.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak2.bak‘ MIRROR TO disk = ‘D:\TestDBBackupFolder\Sitedb_bak3.bak‘, disk = ‘D:\TestDBBackupFolder\Sitedb_bak4.bak‘ WITH --backup set options Compression ,DESCRIPTION =N‘descr-site‘ ,NAME =N‘name-site‘ --,RETAINDAYS =28 --,EXPIREDATE=N‘2016-07-12 11:35:54.220‘ --Media set options ,INIT ,NOSKIP ,NOFORMAT ,MediaDescription=N‘Mdiea Descr‘ ,MEDIANAME = ‘Meida_name‘;
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原文地址：http://www.cnblogs.com/ljhdo/p/5664618.html
