I need clarification of what is meant by an "inconsistent catalog 
backup" on
p. 161 of the NBDC System Administrator's Guide.

If any of the forbidden operations would render the catalog backup 
useless
for disaster recovery the suggested procedure is worthless without an
interlock mechanism.

If such a procedure is used by the automatic catalog backups why hasn't
it been used in the script provided?

How can one be sure that both the images backup and catalog backup are
"consistent"?

Finally, if the catalog is on a VxFS filesystem, would snap'ing it avoid
the consistancy issue?