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Date: Thu, 2 Apr 2015 21:51:59 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Olivier Nicole <olivier.nicole@cs.ait.ac.th>
Subject: Re: Dump(8) does not do incremental
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On Fri, 3 Apr 2015, Olivier Nicole wrote:

> Thanks Warren,
>
>>> Is there any reason why dump would not do incremental when used with -f -?
>> -u to update /etc/dumpdates after a success?
>
> That was it. But I now wonder what was the twisted reason behind that
> behaviour (that is not documented, man pages mention the various
> levels, not saying they are not working unless -u); I understand one
> may want to not implement the incremental dumps, but the default
> should enable them.

Hmm.  It should certainly be mentioned in the man page.  I only remember 
-u because I usually have to look up what it does.