Filesystem dump incremental?

Matthew Seaman matthew at
Thu May 17 11:43:48 UTC 2012

On 17/05/2012 12:49, Matthias Petermann wrote:
> currently I am experiencing something confusing. Some hours ago I did a
> level 0 dump with the following command:
>     dump -a -0 -f /mnt/da0/backup-compaq.0.dump /
> This results in a quite big dump file. After changing a couple of files,
> I tried to do another dump. This time as level 1. My expectation was
> that the resulting dump would only contain the files which changed since
> the level 0 dump.
>     dump -a -1 -f /mnt/da0/backup-compaq.1.dump /
> To my surprise this seems to generate another full dump instead of
> incremental.
> What did I miss or what mistake do I make?

You need '-u' on tose command lines in order to record the dates of your
dumps, including your initial level 0 dump, in /etc/dumpdates.



Dr Matthew J Seaman MA, D.Phil.

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