On 25 Jun 2005, at 17:07, Paul Biggar wrote:
> I need to backup my system, and searching google gave significant
> information overload. I don't need incremental backups, don't need it
> to fit on CD-R, and want to get everything (except partition info, i
> can do that manually, although if its easy...).
>> I have a load of partitions, all reiserfs, and want to copy them to my
> windows partition while I wait for my new HD.
Wow - you use reiserfs. And on a dodgy hard disk too. You like to live
> I was thinking the easiest thing to do is:
> cat /dev/sda2 > /mnt/windows/sda2.backup
>> and then, when the new disk comes in:
> cat /mnt/windows/sda2.backup > /dev/sda2
>> and maybe add a pipe to bzip2. Will this work? Is there something I'm
> missing which explains the need for cpio/tar etc?
It will work, but it leaves you very dependent on matching partition
sizes etc. Much more generally useful to do something like
tar czf /home /mnt/windows/home.tar.gz
you could use cjf on anything resembling a modern Linux to use bzip2
compression instead of tar. You might get 5-10% better compression at a
cost of much much longer compression times.
P.S. I was curious, so did a little experiment.
Files Size gzip size / time bzip2 size / time
/boot 6616KB 5736KB / 4.3s 5784KB / 23.8s
/var/log 15576KB 4048KB / 5.8s 3500KB / 61.1s
So depending on your data, bzip2 MAY compress better, but is always
much slower. The two examples I chose probably showed opposite ends of
the spectrum in compressibility.
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