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Date: Sun, 17 Jun 2012 22:12:32 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Gary Aitken <freebsd@dreamchaser.org>
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Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject: Re: dumping file system subtree (/var)
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>> alternatively - use tar.
>
> What I was trying to achieve, which I haven't done yet, was a smallish dump of the "core system".  By that I mean system + ports, without distfiles, etc.  Then a separate dump of user data, which is considerably larger.  At this point I am thinking I should do this:
>  make clean distclean  ports to remove temporary stuff
>  set /usr/home NODUMP
>  dump /, /var, and /usr
>  unset /usr/home NODUMP
>  dump /usr/home

really - use tar.

dump is not for that, but to QUICKLY dump a filesystem.

on SSD - both are faster than writing to backup target disk.