The differential partial backup is including a read-only filegroup, '%1!s!'. This filegroup was read-write when the base ...

The differential partial backup is including a read-only filegroup, '%1!s!'. This filegroup was read-write when the base partial backup was created, but was later changed to read-only access. We recommend that you create a separate file backup of the '%2!s!' filegroup now, and then create a new partial backup to provide a new base for later differential partial backups.