Hi,

Tino Schwarze wrote on 2009-08-24 11:19:02 +0200 [Re: [BackupPC-users] Rsync 
incremental backup, makes a full backup instead of incremental]:
> On Mon, Aug 24, 2009 at 11:39:28AM +0300, Roman wrote:
> > [...]
> > I have made a full backup, but which contained only a few files (just
> > for testing), after this I setup all needed directories for the
> > backup, and all incremental backup's afterwards look like a full
> > backup. [...]
> 
> Look at the configuration setting $Conf{IncrLevels}
> 
> It defaults to 1, so all incrementals will be based on the last full. If
> you configured, for example, 1 weekly full and want 6 incrementals each
> based on the previous, set
> $Conf{IncrLevels} = [1,2,3,4,5,6];
> [...]

yes, but after any large change to either your backup data set definition or
the data set itself, you should basically run a full backup, both to get a
stable sane (keepable) backup of your data, and to avoid redundant transfers.

For rsync(d), this is inexpensive (bandwidth wise), for other XferMethods it
is simply important, because the incrementals don't correctly track deletions
(and new/moved files with old modification dates). You need to make regular
full backups in any case, and a configuration change like you described it is
definitely an occasion where you would manually cause one to be run.

Regards,
Holger

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