On Tue, 2 May 2006 23:38:42 +1000
"James Harper" <[EMAIL PROTECTED]> wrote:
> > _never_ replaces backup.  I can have 1000 redundant systems dispersed
> > across the entire galaxy, and if a user accidentally deletes an
> > important record, I'll still need to go to backup to recover it,
> > since the redundant systems will faithfully delete it from all
> mirrors.
> 
> There are filesystem based solutions to this particular problem, (and
> I'm not talking about the 'recycle bin' :), where all changes to files
> are kept in the filesystem for a specified period, and you can say to
> the filesystem "I want to see this file or this directory as it was at
> 2:37pm last Tuesday, just before my wife dropped by with my 2 year old
> son and he started banging away on the keyboard while I wasn't
> watching".
> 
> There are also application based solutions, eg CVS, although that
> requires a bit more discipline and/or mucking around.
> 
> I'm not suggesting that this in any way reduces the need for an offsite
> backup, but it can relieve some of the need to go and fetch last
> Monday's tape from the offsite location to restore a single file.

It's a good point, and part of our plan.  Using PostgreSQL transaction
log rotation will give us point-in-time recovery of the database.  We're
already using subversion to track a number of things.

As you noted, it doesn't replace the need for backups.  For one thing,
lawyers and governments stipulate certain things, and saying "we don't
need that because we have this instead" doesn't fly with them.

-- 
Bill Moran
Collaborative Fusion Inc.

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