Selecting the 'Filegroups or files' option in the Back Up or Schedule Backup Jobs wizards will create a full filegroup backup.
To take a differential filegroup backup, add WITH DIFFERENTIAL to the BACKUP command. There isn't an option in the wizards to take a differential filegroup backup, but you can include this option in the extended stored procedure or command line instruction. If you want, you can use the Back Up wizard to generate the BACKUP command without running it:
- Select the relevant options to take a filegroup backup of the relevant files of your database.
- Copy the command (either as an extended stored procedure or command line instruction) from the script tab on the final step of the wizard, then cancel the wizard so that you don't take the backup yet.
- Edit the command in an application such as Management Studio to add WITH DIFFERENTIAL (or any other options you require).
- Execute the command.
If you are creating a scheduled backup job, you can create the job using the Schedule Backup Jobs wizard, then edit the job in Management Studio to add WITH DIFFERENTIAL to the BACKUP command (you may want to edit the job name from the wizard so you can find it easily in Management Studio). If you need to edit the job again, you can use the SQL Backup GUI - any additional options which are not supported by the GUI (such as WITH DIFFERENTIAL for filegroup backups) will be preserved but not editable.
More information on the BACKUP command syntax is available here: http://www.red-gate.com/supportcenter/C ... BACKUP_cmd
I hope that helps.