Michael Tokarev <mjt@xxxxxxxxxx> writes:
> Dean S. Messing wrote:
>> Michal Soltys writes:
> []
>> : Rsync is fantastic tool for incremental backups. Everything that didn't
>> : change can be hardlinked to previous entry. And time of performing the
>> : backup is pretty much neglible. Essentially - you have equivalent of
>> : full backups at almost minimal time and space cost possible.
>>
>> It has been some time since I read the rsync man page. I see that
>> there is (among the bazillion and one switches) a "--link-dest=DIR"
>> switch which I suppose does what you describe. I'll have to
>> experiment with this and think things through. Thanks, Michal.
>
> I haven't actually read the rsync manpage to this detail, but I
> do use rsync for backups this way, but a bit differently - yet
> more understandable without referring to manpages... ;)
>
> the procedure is something like this:
>
> cd /backups
> rm -rf tmp/
> cp -al $yesterday tmp/
> rsync -r --delete -t ... /filesystem tmp
> mv tmp $today
>
> That is, link the previous backup to temp (which takes no space
> except directories), rsync current files to there (rsync will
> break links for changed files), and rename temp to $today.
I was thinking Michal Soltys ment it this way. You can probably
replace the cp invocation with an rsync one but that hardly changes
things.
I don't think you can do this in a single rsync call. Please correct
me if I'm wrong.
MfG
Goswin
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