[CentOS] Rsync and differential Backups
Frank Thommen
lists.centos.de at drosera.ch
Mon Nov 9 22:19:39 UTC 2015
Ciao Alessandro,
On 11/09/2015 05:01 PM, Alessandro Baggi wrote:
> Hi list,
> how to perform a differential backup using rsync?
>
> On web there is a great confusion about diff backup concept when
> searched with rsync.
>
> Users says diff because it copy only differences. For me differential is
> backup from last full backup.
Which is basically the same...if you always use your last full backup as
"base" directory. Use rsyn's --link-dest option to achieve this. Nice
thing: Unchanged files will just be hardlinked to the original files and
won't use additional disk space, but still each dataset is a coopmlete
backup. There is no need to combine several incremental or differential
backups to restore a certain state.
Mike Rubel's page has already been mentioned. On
http://www.drosera.ch/frank/computer/rsync.html I describe an alternate
mechanism (using above mentioned --link-dest and an rsync-server) which
overcomes some of the - imho - shortcomings of Mike's setup.
And: rsync is a fan-tas-tic backup tool ;-)
HTH
Frank
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