How to emulate rdiff behaviour

[Daniel.Li]

Dear Wayne,
Excellent, that's really what I have expected!

Is it stable now? Cause I have found that this feature seems to be
unstable before ver 3.0.6. 

- Fixed a --read-batch hang when rsync is reading a batch file that was
      created from an incremental-recursion transfer.

http://samba.anu.edu.au/ftp/rsync/src/rsync-3.0.6-NEWS 


On Fri, 2009-05-29 at 23:48 -0700, Wayne Davison wrote:
> On Thu, May 28, 2009 at 11:32:16AM -0400, Matt McCutchen wrote:
> > - Each day, generate a reverse batch (by running rsync in the reverse
> > direction with --only-write-batch) and then update the destination file.
> 
> In order to avoid any inconsistency between the files when the reverse
> run is done and when the backup copy is done, you could use a second
> full backup copy (though someone using something like LVM could use
> snapshots instead).
> 
> To be explicit, a two-dir method would start by duplicating the backup
> dir (let's assume to a separate host, though it would also work without
> "bhost:" in all these commands):
> 
>     rsync -av /backup/ bhost:/backup2/
> 
> Then a backup operation would be:
> 
>     rsync -av srchost:/src/ /backup/
>     rsync -av --only-write-batch=/batches/$DATE bhost:/backup2/ /backup/
>     rsync -av /backup/ bhost:/backup2/



And one more thing here:
If you are going to prepare this batch file, it seems there will be double the workload of network, see below statements? Is that right?

> rsync -av --only-write-batch=/batches/$DATE bhost:/backup2/ /backup/
> rsync -av /backup/ bhost:/backup2/


> 
> That results in the daily double-backup dirs and a batch that lets you
> get back to the prior day's files.
> 
> A restore operation would require running a sequence of batch files into
> the /backup/ dir (without any backups running):
> 
>     rsync -av --read-batch=/batches/$DATE1 /backup/
>     rsync -av --read-batch=/batches/$DATE2 /backup/
>     ...
> 
> Then, after restoring the file(s), revert /backup to the most recent
> backup data:
> 
>     rsync -av bhost:/backup2/ /backup/
> 
> ..wayne..
-- 
Daniel Li