[GRLUG] mirroring function

[Dan Pilcheck]

On Mon, Aug 29, 2011 at 1:38 PM, Bob Kline <bob.kline at gmail.com> wrote:
> I have a USB backup drive, which I only
> turn on when I want to back up my system.
> And I only do that now and then for time
> reasons - even on a USB 2 connection it
> takes a couple of hours for a full backup.
> So what I like to do is incremental backups.
> The way I do that now is simply to mount the
> drive and run "cp -Rpu . /drive/directory" from
> the top of the directory area that I want to
> back up.
> This works fine except that the "u" option
> ensures that anything on the primary drive
> not on the backup drive is copied over, but things
> that are not on the primary drive, and are on
> the backup drive, do not get erased, which is
> what I want.  I've read the man page, and
> there does not seem to be an option for doing
> this.
> What I'm really looking for is a mirroring
> function, but only on a now and then basis,
> not having two drives running all the time.
> Suggestions?  I hear that rsync does something
> like this.  Can it do this locally, between two
> drives?  i.e., I don't need the "remote" part.
>   -- Bob
>
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Bob,
If I run rsync with something similar in mind, I'd check out
"rsync -vazpHEK"  - verbose, archive, compress...
-K, --keep-dirlinks   treat symlinked dir on receiver as dir
-E, --executability   preserve executability
-H, --hard-links   preserve hard links

-o -g -X -u might be of use too!

Hope that helps
-- 
Who is to say that the next step in evolution is not a statistical
chance but rather a by-product of our own will?
That from here on out, nature stops deciding who survives and who
doesn't, but our own decisions?

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