I am not using SBS2003's 'Server Backup Wizard', as it lacks a lot of the basic features I'd expect in a backup wizard - Namely I can't see an easy option to configure 'incremental/diff' backups! It may be there, but I couldn't find it!
Anyway, I have configured NTbackup with a full backup on Wednesday and a full backup on Friday, with incrementals inbetween. This is the setup I'm happy with. It's working fine, however I noticed when I receive my morning email with the server performance reports, it states 'backup did not run'. How can I tell the system that it's not using the 'Server Backup Wizard', and to correctly report whether the backup has run?