Re: [rdiff-backup-users] Safe to mirror backup dir with rsync?

[Engel Sanchez]

Hi Jakob. That depends on the application using those files.  If we are taking 
about a source code repository like subversion, having some files new, some 
files old like that might make the repo unusable anyway.

 Engel A. Sanchez


“Do what you love to do and give it your very best. Whether it's business or 
baseball, or the theater, or any field. If you don't love what you're doing and 
you can't give it your best, get out of it. Life is too short. You'll be an old 
man before you know it.”


http://engelsanchez.net



----- Original Message ----
From: Jakob Unterwurzacher <address@hidden>
To: address@hidden
Sent: Wed, December 23, 2009 8:25:33 PM
Subject: Re: [rdiff-backup-users] Safe to mirror backup dir with rsync?

Am 2009-12-24 01:55, schrieb Engel Sanchez:
> Hi Alex. My understanding could be wrong, but this is the scenario that I'm 
> trying to avoid:
> 
> 1) Machine 1 has the original data and backs it up locally to /backup
> 2) Machine 2 rsyncs /backup to local /backup every day
> 3) Machine 2 is rsyncing /backup, and right then machine 1 dies for good 
> (fire, flood, apocalypse)
> 
> At that point in time, machine 1 is dead and /backup in machine 2 is not a 
> valid rdiff-backup directory, so you can't restore your data from it anymore.

You can still restore from machine 2.

The history will probably be broken and the latest backup will at the 
filesystem level not be a perfect snapshot in time (if you aren't using LVM 
snapshots you don't get that snapshot in time anyway).

But every file in the latest backup on it's own will be consistent (rsync does 
not modify files in-place).

So, you will have some files that are from the latest backup, some that are 
from the one before.

Acceptable IMO.


Jakob


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