On Sat, 2008-11-08 at 20:11 +0100, misiek wrote:
> I have got three folders:
> - /home/backup/2008-10-20 - place for differential backup
> - /mnt/for_backup - folder with files for backup
> - /home/backup/2008-10-01 - place where the last full backup is
>
> My question: is below command prepared correctly to make differential
> backup?
>
> rsync -avPbn --backup-dir=/home/backup/2008-10-20/ --exclude "System
> Volume Information" --exclude "RECYCLER" /mnt/do_backup
> /home/backup/2008-10-01


No. --backup-dir does not do what you think it does. To make a forward
differential backup, you want to use --compare-dest:

rsync -avPbn --compare-dest=/home/backup/2008-10-01/ \
--exclude "System Volume Information" --exclude "RECYCLER" \
/mnt/do_backup /home/backup/2008-10-20

Consider whether you want a trailing slash on the source; see the second
and third examples in the "USAGE" section of the man page.

Matt

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