I need to give a group the role of db_backup operator. do they need anything else like db_datareader or writer? I'm not sure what they will be able to do other than backup? I've never given anyone this role.

Thanks

This is SQL forum (language, not database). Your question seems to be database-dependant, so you'd perhaps better ask it in forum which covers the database you use (is it MS SQL Server, DB2, ...?).