Subject: Re: Tape Backups -- tar vs. dump
To: None <firstname.lastname@example.org>
From: Aaron J. Grier <email@example.com>
Date: 01/02/2001 17:02:03
On Tue, Jan 02, 2001 at 05:47:45PM -0600, John Maier wrote:
> -1 will backup the changes from -0
> -2 will backup the changes from -1
> -3 will backup the changes from -2
> and so forth, correct?
> (The man page should be updated to elaborate on this issue)
like most things unix, the information is in there, but is very
terse. from dump man page:
A level number above 0, incremental backup, tells dump
to copy all files new or modified since the last dump of
a lower level. The default level is 9.
> So I should define for each day it own dump level...
> Saturday 1:00am : dump -0 ...
> (Skip Sun and Mon, because previous day not a work day(for us :-))
> Tuesday 1:00am : -1
> Wednesday 1:00am : -2
> Thursday 1:00am : -3
> Friday 1:00am : -4
> Saturday start over with -0
> Does this look like a sane system?
it'll work, but if you need to perform a full restore from friday,
you'll need to restore five tapes. using the tower of hanoi algorithm
as mentioned in the dump man page in the sequence 0 1 3 2 5 means you
would only have to restore four tapes.
I'd also suggest two (or more) sets of tapes with one of them stored
off-site, so in case your computer room burns up, or somebody goes crazy
with a magnet, or your level 0 tape fails, you'll still have some kind
I use two sets of tapes. every month I perform a level 0. every week
goes 1 3 2 5 4. at the end of the month this set is swapped with the
Aaron J. Grier | "Not your ordinary poofy goof." | firstname.lastname@example.org
"[I]f you can find the purity in hardcore and gabber, I guess you're
already screwed up enough." -- Drew Smith