checkout or update?

[Dirk Luetjens <dirk post lfm rwth-aachen de>]

Hello,

a short CVS question:

Is it better to do an checkout or an update every time I want to update my
repository?

The problem is, that when I do an update and new directories are added
they are not downloaded, so that the final build process will fail.
Perhaps I missed the necessary option :-)

Dirk