I've just noticed /usr/nsh/br/bnp growing in size only to see that snapshots and audit results are apparently stored here. Can you tell me why these files are not removed when the old audit and snapshots are deleted?
These are temporary files - basically a cache of the snapshots and audits. You can remove the contents of this directory (though not while a snapshot or audit job is running)
This is related to a known issue where these files are not automatically cleaned up during the 'cleanup' procedure.