此备份是读写数据的文件备份，这些数据所在的数据库使用简单恢复模式。只有在计划将文件组设置为只读，并进行差异文件备份时，才可以这样做。有关管理简单恢复模式的只读数据的详细信息，请查阅联机丛书。请具体考虑部分备份的使用方法。

This backup is a file backup of read-write data from a database that uses the simple recovery model. This is only appropriate if you plan to set the filegroup to read-only followed by a differential file backup. Consult Books Online for more information on managing read-only data for the simple recovery model. In particular, consider how partial backups are used.