Mailinglist Archive: opensuse (2348 mails)

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Re: [opensuse] Suggestions for backup software?
  • From: G T Smith <grahamsmith@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
  • Date: Tue, 01 Apr 2008 09:58:43 +0100
  • Message-id: <47F1F943.1080200@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Hash: SHA1

Carlos E. R. wrote:

The Monday 2008-03-31 at 10:23 +0100, G T Smith wrote:

Yes, but it appears that is cheaper to have the capacity on external HDs
on USB boxes, than to backup to DVDs, even if you have two or three
disks. And they can be reused and rotated, similar to tapes.

Plus, it is much faster! You don't have to be there changing DVDs. You
just program it and leave.

Cost is an often stated factor, however with removable media one has a
potentially infinite storage capacity which can be adjusted in
relatively small increments at a small progressive cost, whereas with
hard drives one the integration of a new drive into a backup system
requires a little more effort and a more significant initial outlay.

Optical media take up relatively little physical space have a relatively
good shelf life. The 4-5 year potential lifespan is probably adequate
for archival purposes as one has the option of migrating the contexts
before the media hits end of live.

External USB based hard drive units come with a lot of additional
baggage which one will not get with a caddy based approach. One also has
the additional benefit that one has access to the drive diagnostics,
(Using a dodgy drive to backup to is probably not going to be helpful),
and is probably bit more storage friendly than a based USB device. I am
not arguing against the use of hard drive for the purpose, merely
suggesting that an USB based external device is possibly not the best
option for this route. (eSata has been mentioned and it this stage I am
in no position to comment on this as an option)

Speed is more down to the mechanism used, what I am working on at
moments spends 90% of the time building and documenting an archive and
only about 10% of the time actually creating and burning an image of
that archive to DVD.

What does complicate matters somewhat with a pure file based backup
mechanism is that for some applications merely replacing the files may
not be adequate, (mysql, subversion are two I can immediately think of
for which it is probably preferable to use their own backup and restore
processes to backup and recover data than merely copy the physical
files). Mail archives can present some intriguing problems (I have
before now found every mail duplicated on a client after a server been
restored which was more than a bit of a nuisance).

If have looked at KDar/Dar and felt that these did not really work very
well as a Tar/Star alternative. The Ghost/image based approach is good

I don't really like tar and similar things: they are easier to break,
specially if compressed; and recovery from a large archive is slow and

Pity rsync can not compress.

I have a work round for compression and tar, rather than compress the
archive as whole (which I believe is the default behaviour) I have a
prototype perl class library that compresses files on an individual
basis and tars them.

You can use compressed DVDs, by the way.

-- Cheers,
Carlos E. R.

- --
I have always wished that my computer would be as easy to use as my
My wish has come true. I no longer know how to use my telephone.

Bjarne Stroustrup

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