Controlfile backups

Almost everbody knows how to create backups of the controlfile.

Usually a

alter database backup controlfile to trace;

is used.

And now for the 64000$ question:

Which information is not backed up by this command?

The answer is:

THE BACKUP RECORDS!

In order to prevent the loss of this information you can better use the following command:

alter database backup controlfile to '/a_real/location/inyour/system';