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Date:      Thu, 04 Jan 2001 01:45:03 +0100
From:      bdluevel@heitec.net
To:        questions@freebsd.org
Subject:   Re: a very dumb backup question
Message-ID:  <3A53C78F.359C6A80@heitec.net>
References:  <14931.48360.311640.703454@guru.mired.org>

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Mike Meyer wrote:
[...]
> Final comment - I'd recommend dump instead of tar, especially for the
> root file system, because historically it's tracked changes to the
> file sysystem and special files better than tar.


I've got an additional question concerning dump vs. tar: I seem to
remember that tar has an built-in limit of 8 GB per single backup,
because of some restriction in the tar file format. Is this true, and
what are the limits for dump and pax? And, given that backups sizes are
limited, how to best backup a 30 GB partition using 20 GB tapes?
Chunk-wise, with several 'tar' runs to the same tape without rewinding,
I assume? (Repartitioning into partitions with less than 8 GB each is
not an option in my situation, I'm afraid.)

Is there a way to let 'dump' backup less than an entire partition, such
as a directory and all its subdirectories?


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