On Thu, 13 Jan 2005 tobias.bluhm AT philips DOT com wrote:
> Using rsync:
> 
> shutdown db
> rsync all data to backup disk/raid/machine
> start db
> amanda backup the backup disk/raid/machine
> 
> The first run of rsync will be the slowest - must send all data to make a 
> complete copy. The next run of rsync will be much faster. rsync only sends 
> new or changed data. So if 3 bytes in a 1G file are changed, only the 
                                                               ^^^^^^^^
> changed 3 bytes are sent. Plus you have the lastest backup copy in an 
  ^^^^^^^^^^^^^^^^^^^^^^^^
Hmm, not exactly true ;-) Rsync operates on blocks.

> easily retrieved format. Your rsync speed will depend on the size of the 
> db & the amount of daily changes.

And make sure to use `rsync -za --delete'. You can drop the `-z' if you don't
want to use compression (for slow CPUs and very fast networks).

Gr{oetje,eeting}s,

                                                Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert AT linux-m68k 
DOT org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                                            -- Linus Torvalds