Backups de arquivos diferenciais podem incluir apenas dados de leitura de bancos de dados que usam o modelo de recuperação simples. Considere fazer um backup parcial especificando READ_WRITE_FILEGROUPS.
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English version
Differential file backups can include only read-only data for databases using the simple recovery model. Consider taking a partial backup by specifying READ_WRITE_FILEGROUPS.
SQL Server