部分差异备份将包括只读文件组 '%1'，因为自进行基本的部分备份以来，该文件组中的一个或多个文件没有进行基本备份。建议对文件组 '%2' 单独进行一次备份，然后再执行一次新的部分备份。

The partial differential backup is including readonly filegroup '%1' because one or more of its files does not have a base backup since the base partial backup was made. It is recommended that a separate filegroup backup of '%2' is made and a new partial backup taken.