BackupPC-users

Re: [BackupPC-users] Defining data retention periods

2009-04-29 09:24:34
Subject: Re: [BackupPC-users] Defining data retention periods
From: Holger Parplies <wbppc AT parplies DOT de>
To: Boniforti Flavio <flavio AT piramide DOT ch>
Date: Wed, 29 Apr 2009 15:19:49 +0200
Hi,

Boniforti Flavio wrote on 2009-04-29 14:22:36 +0200 [Re: [BackupPC-users] 
Defining data retention periods]:
> > > OK, now the main question of my post: data retention.
> > > [...]
> 
> In my actual setup when the oldest FULL gets deleted (because it is now
> older than 4 weeks), do I loose also all the subsequent INCREMENTALS that
> were done?

would you implement it that way? Then why do you assume it is implemented that
way? Why don't you just, for once, simply wait and see? BackupPC will show you
for free.

Understanding BackupPC is much easier if you assume it behaves in a sane,
logical way, than if you suspect everything that could possibly go wrong will.

> I mean, isn't an INCR backup related to its FULL one?

Right.

> Thus, if the oldest full gets outdated, the subsequent INCR ones wouldn't
> allow me to recover data (because of the missing FULL)...

So the full is kept until no incrementals depend on it, and everything is
fine. Simple and straightforward.

> So, wouldn't it make more sense to retain 5 FULL backups?

If you *want* 5 full backups, then set it up like that. If you *want* 4 full
backups, set it to 4, and BackupPC will do the sensible thing - keep 4 unless
5 are needed due to dependant incremental backups.


I believe, all of this is even documented somewhere, and, knowing me, I'll
have had a quick look at the comment for FullKeepCnt in the default config.pl
just to verify.

Regards,
Holger

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