Re: [BackupPC-users] Full and Incrementals Backup question

Right :)

On Sat, Apr 17, 2010 at 9:16 AM, Inno <innop AT voila DOT fr> wrote:

You disturb me ;-) !
I summarize to be sure I understand.

Full : 600 GB
Data modify by day : 10 GB

-------
IncrLevel = 1

M | T | W | T | F | S | S | <- Day

I | I | I | I | F | - | - | <- Backup type

1 | 1 | 1 | 1 | 0 | - | - | <- Level

10| 20| 30| 40|600| - | - | <- DATA COPY BY DAY (GB)

2nd day you have 20GB different, but 10 are already on the pool. pool grows only 10GB
3rd day you have 30GB different, but 20 are already on the pool. pool grows only 10GB
...
You end up with 640GB

-------

IncrLevel = 1, 2, 3, 4

M | T | W | T | F | S | S | <- Day

I | I | I | I | F | - | - | <- Backup type

1 | 2 | 3 | 4 | 0 | - | - | <- Level

10| 10| 10| 10|600| - | - | <- DATA COPY BY DAY (GB)

640GB

-------
With IncrLevel 1, 2, 3, 4 i'm sure that the incrlevel 3 will be not delete if 2, 1 and 0 exist.

It will be the other way around. 0,1,2 will not be deleted if 3 exist

With IncrLevel 1, I'm not sure about that...

You may be making things more complicated that they are.

You set
FullKeepCnt = 3
IncrKeepCnt = 10

3 full and 10 incremental are guarantied. There will be more if needed

You may use the exponential expiry, but the idea is the same.

-------
FullPeriod = 2
IncrPeriod = 8

That means you do a full every 2 days and one Incremental every 8 days. It has nothing to do with keeping or deleting.

You'll want something like
FullPeriod = 6.97 # (1 every 7 days)
IncrPeriod = 0.97 # (1 every day)

Also I keep two weeks of backup (and I'm sure no backup will be not delete)

So you want
FullKeepCnt = 3 # (thats two weeks divided by FullPeriod=6.97 and 1 extra. It could be 2)
IncrKeepCnt = 15 # (15 days)

That's the basic. Can't be messed with other confs. I do believe that, backuppc is well done :)

-------
-------
-------
Thanks a lot :-)

> Message du 17/04/10 à 08h50

> De : "Luis Paulo" <luis.barbas AT gmail DOT com>
> A : innop AT voila DOT fr

> Copie à : "General list for user discussion questions and support" <backuppc-users AT lists.sourceforge DOT net>

> Objet : Re: [BackupPC-users] Full and Incrementals Backup question
>

> Inno,
> If files are all different, and you modify 10GB every day keeping the 600
> total, I think (pretty sure) that yes, on the 4th you'll have the original
> 600GB plus the 40GB differences.
> That with incrementals.
>
> With fulls every day, you'll have just 600GB every day, total on the pool
> (we are not minding about compression), after the cleanup.
>
> (Really hope Les don't mind me saying what he said with other words. I'm
> taking the chance to think loud with Inno.)
>
> But fulls are slower, even with rsync. That also means that with tar or
> samba are even slower. You know why?
> I'm going to go through http://www.samba.org/rsync/documentation.html.
> Something scared me first time, and I didn't return.
>
> Thanks, Les
>
> Regards
> Luis
>
> On Fri, Apr 16, 2010 at 9:45 PM, Inno <innop AT voila DOT fr> wrote:
>
> > But if I have many data : 600 GB for a full and 10 GB modify by day. An
> > incremental it's better ? Because if I have a differential backup I have 10
> > GB the first day, 20 GB the second day... 40 GB the fourth day... ... no ?
> >
> > M T W T F S S <- Day
> > I I I I F - - <- Backup
> > 1 2 3 4 0 - - <- Level
> > 10 20 30 40 600 <- GB
> >
> >
>

____________________________________________________

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