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Re: [PLUG] Backup to CD-RW
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gabriel rosenkoetter wrote:
On Thu, Feb 27, 2003 at 06:46:07PM -0500, Paul wrote:
I'm curious why the author doesn't use -z to gzip the tar...maybe that
can't be done with a streaming backup?
'The script I currently use consists of a single line: "tar -c -v -f -
/root /etc /home/lnf | cdbackup -d /dev/scd0 -r 0,0,0 -s 4 -v -l 640 -m".'
Probably because his data fit on a single CD-R without zipping and
it would have been more processor overhead to gzip it. (Haven't seen
the site, so I could be off-base.)
In any case, the -z flag *precisely* bzips streaming data.
Outside chance that he could have been fearful of bugginess in zlib
(he'd be well-founded... first 1.1.3 and now 1.1.4 have been shown
to have security-impacting buffer overflows).
I didn't read far enough down. According to the author, "Tar does not
handle compression very well, so I don't use compression."
Here are the compression options for my version of tar:
-j, -I, --bzip
-z, --gzip, --ungzip
-Z, --compress, --uncompress
These are just intersting:
-G, --incremental
-g, --listed-incremental F
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