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- Newsgroups: comp.os.linux
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!darwin.sura.net!haven.umd.edu!wam.umd.edu!joel
- From: joel@wam.umd.edu (Joel M. Hoffman)
- Subject: Re: The backup problem (was Re: tar won't do multi-volume archives)
- Message-ID: <1993Jan11.151640.16986@wam.umd.edu>
- Sender: usenet@wam.umd.edu (USENET News system)
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- Organization: University of Maryland, College Park
- References: <103900@netnews.upenn.edu> <C0JLAn.Hp9@jti.com> <1993Jan11.072222.7301@bronte.boeing.com>
- Date: Mon, 11 Jan 1993 15:16:40 GMT
- Lines: 19
-
- In article <1993Jan11.072222.7301@bronte.boeing.com> paula@bronte.boeing.com (Paul Allen) writes:
- >Tar does support multi-volume backups. Multi-volume archives are not
- >compatible with compression because tar pipes it's output through
- >compress and can't tell where the volume boundaries are. I'm not
- >sure I want to compress my backups, because a single glitch renders
- >the whole thing unusable.
-
- It seems to me the best way to go would be to compress each file
- before it's put in the tar file, and then (obviously) decompress it
- for restores. That way, the backup takes up much less space, but a
- glitch or even a missing disk won't corrupt the backup. I realize
- that the compression ratio will not be as high as it would if the
- whole file-system were compressed, but it will certainly be better
- than no compression at all!
-
- I suppose this could be accomplished by piping find into compress into
- tar, but I'm not entirely sure.
-
- -Joel
-