--以下代码简单地演示了如何进行文件组的备份及还原（在还原时，模拟了丢失第二次文件组备份文件的情况）。
--创建测试数据库
CREATE DATABASE db
ON PRIMARY(
    NAME='db_data',
    FILENAME= 'c:\db_data.mdf'),
FILEGROUP db_fg1(
    NAME = 'db_fg1_data',
    FILENAME = 'c:\db_fg1_data.ndf'),
FILEGROUP db_fg2(
    NAME = 'db_fg2_data',
    FILENAME = 'c:\db_fg2_data.ndf')
LOG ON(
    NAME='db_log',
    FILENAME ='c:\db.ldf')
GO

--在文件组db_fg1上创建表，并单独创建该文件组的备份
CREATE TABLE db.dbo.tb(id int) ON db_fg1
BACKUP DATABASE db FILEGROUP='db_fg1' TO DISK='c:\db_fg1.bak' WITH FORMAT
GO

在其他文件组上创建表
CREATE TABLE db.dbo.ta(id int) ON [PRIMARY]
CREATE TABLE db.dbo.tc(id int) ON db_fg2
INSERT db.dbo.tb SELECT id FROM sysobjects
--备份每个文件组，并且备份事务日志
BACKUP DATABASE db FILEGROUP='PRIMARY' TO DISK='c:\db_primary.bak' WITH FORMAT
BACKUP DATABASE db FILEGROUP='db_fg1' TO DISK='c:\db_fg1_new.bak' WITH FORMAT
BACKUP DATABASE db FILEGROUP='db_fg2' TO DISK='c:\db_fg2.bak' WITH FORMAT
BACKUP LOG db TO DISK='c:\db_log.bak' WITH FORMAT
GO

--删除数据库
DROP DATABASE db
GO

--从文件组备份中恢复数据
RESTORE DATABASE db FILEGROUP='PRIMARY' FROM DISK='c:\db_primary.bak' WITH NORECOVERY,REPLACE
RESTORE DATABASE db FILEGROUP='db_fg1' FROM DISK='c:\db_fg1.bak' WITH NORECOVERY
RESTORE DATABASE db FILEGROUP='db_fg2' FROM DISK='c:\db_fg2.bak' WITH NORECOVERY
RESTORE LOG db FROM DISK='c:\db_log.bak' WITH RECOVERY
SELECT COUNT(*) FROM db.dbo.tb
GO

--删除测试数据库
DROP DATABASE db