Disaster Recovery Guide
http://technet.microsoft.com/en-us/magazine/ee677581.aspx
Backups
http://msdn.microsoft.com/en-us/library/ms187510(v=SQL.90).aspx
Restoring
http://msdn.microsoft.com/en-us/library/ms177429(v=SQL.90).aspx
Backup Sets (Personally, I prefer to backup to individual files)
http://msdn.microsoft.com/en-us/library/ms191248(v=SQL.90).aspx