Thomas Birnthaler wrote:

>> What is the best way to "syncronize" __TOPDIR__ to another location?
>> As I found in many messages, rsync isn't possible because of
>> expensive memory usage for the hardlinks.
> Since version 3.0.0 (protocol 3 on both ends) rsync uses an
> "incremental" mode to generate and compare the file lists on both sides.
> So memory usage decreased a lot, because just a small part of the list
> is in memory all the time. But the massive hardlink usage of BackupPC
> causes very slow copying of the whole structure, because link creation
> on any filesystem seems to be a very expensive task (locks?) ...
> 

So it seems possible to make the initial remote backup by dd and after this
a daily rsync?
Because on a daily basis are (hopefully) not tons of new hardlinks which
have to be created on the remote side.

>> In my opinion dd or cp -a isn't possible too because they would copy
>> all the data. That would consume to much time if I syncronize the
>> locations on a daily basis.
> Any other tool has the same time consumption if it keeps hardlinks
> ("cp" e.g. does that with option "-l").
> 
> A somehow "lazy" solution would be to just copy the "pool"-Files (hashes
> as file names) by "rsync" and create a "tar" archive of the "pc"
> directory.

I would believe that creating of the tar archive and copying it to the other
location will consume nearly the same time, space and bandwidth as dd or
cp. Isn't it?

> The time consuming process of link creation is then deferred 
> to the restore case (which may never be needed).
> 
> Thomas

br
Matthias
-- 
Don't Panic


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