[CentOS] Rsync and differential Backups

[melkor.kp]

Hi

For backups with rsync a recommend you to follow the approach discussed on
this website.
It provides you everything for getting a full backup and then the
incremental ones (deltas) using rsync.
The only thing you need in order to do that is that the hosting filesystem
supports hard links,

http://www.mikerubel.org/computers/rsync_snapshots/

Cheers,
Roberto Nebot

2015-11-09 17:01 GMT+01:00 Alessandro Baggi <alessandro.baggi at gmail.com>:

> 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.
>
> Other users says that to perform a differential backup I must include in
> rsync command: --backup --backup-dir=/some/path but from manual page of
> rsync:
>
> #############
> --backup-dir=DIR
>               In combination with the --backup option, this tells rsync to
> store all backups in the specified directory on the receiving side. This
> can be used for incremental backups.  You can additionally specify a backup
> suffix
>               using the --suffix option (otherwise the files backed up in
> the specified directory will keep their original filenames).
> ....
> ###################
>
>
> Then at this point, I can perform a full backup copying base dir after
> last incremental. I can performa an incremental backup saving change on a
> specified destdir (using --backup-dir).
>
> How I can perform a diff backup?
>
> I know that rsync check differences using "the base dir". This dir have
> "the same content" of backupped source. To make incremental, this base is
> used.
> Supposing that I've 500 GB data on source. Make/sync the base-dir of 500GB.
> Running a full backup (the result file must be a fullbackup.tar.gz), at
> the end of the process I get a base-dir of 500GB and a .tar.gz of +/- 500GB
> compressed. Is correct make full backup, performing first an incremental
> backup on the base-dir and then compress it on a .tar.gz? Or is better
> resync all source in alternative destdir?
>
>
> In this example I've spent the double space for a full and a base-dir.
> 500GB Source vs 1TB for base-dir and a full.tar.gz. There is a way to
> performs other operation (incr and diff) without using the base and save
> disk space?
>
>
> Thanks in advance.
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