Seaquel
SQL Server error code

SQL Server error 3004

SQL Server raises error 3004 at severity 16, which marks a problem with the query or data that you can correct.

The primary filegroup cannot be backed up as a file backup because the database is using the SIMPLE recovery model. Consider taking a partial backup by specifying READ_WRITE_FILEGROUPS.
Msg3004
Severity16
Group3000–3999

Source: Database Engine events and errors