if a file is deleted between the prescan and backup phaze, you'll get the first error
if a file is changed while being backed up, or is changed between the backup and verify phaze, you'll get the second error.
the first should be an exception, but for some reason, backup exec claims the second is a failure. i don't get it either.
the second error is probably due to someone leaving a kronos instance running on their desk when they left for the night. database files, which this appears to be, respond poorly to multiple access.