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#1 (**permalink**) 01-16-2008, 07:05 PM

when using tar.gz to backup files on the server does compression change
the files integrity?

like in gzip if i use no compression over best compression.

#2 (**permalink**) 01-16-2008, 07:05 PM

In article <1113424317.793458.310270@l41g2000cwc.googlegroups .com>,
c0re <spiv007@gmail.com> wrote:
>when using tar.gz to backup files on the server does compression change
>the files integrity?

If I understand your question, the answer is no, no "integrity" is lost.
Using the language usually used to describe these things, no information
is lost. A file restored after backing up using tar and gz is identical
to a file restored using tar alone or a file just restored from a plain
copy.

What you gain from compression is a smaller file. What you lose is the
time and computational resoures used to compress and uncompress it.
Depending on the speed of your bcakup media, it may be faster to
compress->cop in->copy out->uncompress than to copy alone.

>
>like in gzip if i use no compression over best compression.

Gzip is a good example. The "best" compression produces a smaller .gz
file at the cost of a longer time to produce the compressed file.
Gzip has a range of compressions so you can tune the level to meet your
needs.

Myself, I usually use default compression or best, but others needs may
differ.
>

--
--
Larry Headlund lmh@world.std.com Mathematical Engineering, Inc.
(617) 242 7741
Unix, X and Motif Consulting Speaking for myself at most.

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