Thanks for your response.
It's a good reasoning !

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



> Message du 16/04/10 à 17h52
> De : "Luis Paulo" <luis.barbas AT gmail DOT com>

> A : innop AT voila DOT fr, "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
> Copie à :
> Objet : Re: [BackupPC-users] Full and Incrementals Backup question
>

> Better than all 1? In theory, yes
>
> 1 - On backuppc there is no need to restore level 1 to 3 in order to allow
> level 4 restoring.
>
> 2 - Neither there is the issue that a problem with a lower level previous
> incremental backup gets corrupted and invalidate the following backups -
> That can not be confused with stating that backuppc is problem free.
>
> Those are clues to say that all level 1 can be the same of 1,2,3,4. Or not.
>
> We can say that a backup level 4 will be made against previous level 3,
> instead against last full.
>
> Thus storing less differences (smaller and faster). we may think.
> But that's, for sure, when incremental take space of their one, in a
> separate file on disk/media.
>
> With backuppc and the hardlink process, it's not smaller, I think. An
> incremental will only create the files that are not on the previous
> incremental (*), the rest will already be on the pool, just creates a
> hardlink.
>
> (*) Meaning "An incremental will only create the files that are not on the
> pool already". Right?
>
> So, smaller? I think not.
>
> Safer? Don't see why.
>
> Is it faster? Probably, but that depends on how the process work, and I
> don't know to answer that.
>
> Anyone? :)
>
> Regards
> Luis
>
> PS: Maybe incremental is just here to make people used to "classical"
> backups to feel comfortable. :)
>
> On Fri, Apr 16, 2010 at 1:19 PM, Inno <innop AT voila DOT fr> wrote:
>
> > Humm... maybe
> > IncrLevel = 1,2,3,4 it's bester ?
> >
> >
> >

> Message du 09/04/10 à 16h00
> De : "Inno" <innop AT voila DOT fr>
> A : "Andrej Žbontar" <andrej.zbontar AT atnet DOT si>, "General list for user discussion questions and support" <backuppc-users AT lists.sourceforge DOT net>
> Copie à :
> Objet : Re: [BackupPC-users] Full and Incrementals Backup question
>
> Oh.. yes... I have not read "IncreLevels". Thanks a lot.
> Also...
> FullPeriod : 10 (but I force it by crontab on friday night)
> FullKeepCnt : 2
> IncrPeriod  : 1
> IncrKeepCnt : 8
> IncrLevel : 1, 2, 3
> Blackout on weekend (and during week on 7am to 10 pm)
>
> That's an example : I am on 30/04.
>
> DELETE - 09/04 - Level 0 - Friday : Full
> DELETE - 12/04 - Level 1 - Monday : Incr - Depends on the level 0
> DELETE - 13/04 - Level 2 - Tuesday : Incr - Depends on the level 1
> DELETE - 14/04 - Level 3 - Wednesday : Incr - Depends on the level 2
> DELETE - 15/04 - Level 4 - Thursday : Incr - Depends on the level 3
>
> KEEP - 16/04 - Level 0 - Friday : Full (keep because incr depends it)
> KEEP - 19/04 - Level 1 - Monday : Incr - Depends on the level 0
> KEEP - 20/04 - Level 2 - Tuesday : Incr - Depends on the level 1
> KEEP - 21/04 - Level 3 - Wednesday : Incr - Depends on the level 2
> KEEP - 22/04 - Level 4 - Thursday : Incr - Depends on the level 3
>
> KEEP - 23/04 - Level 0 - Friday : Full
> KEEP - 26/04 - Level 1 - Monday : Incr - Depends on the level 0
> KEEP - 27/04 - Level 2 - Tuesday : Incr - Depends on the level 1
> KEEP - 28/04 - Level 3 - Wednesday : Incr - Depends on the level 2
> KEEP - 29/04 - Level 4 - Thursday : Incr - Depends on the level 3
> KEEP - 30/04 - Level 0 - Friday : Full
>
> And if I am on 28/04 (for example) I keep all Backup on 09/04 to 15/04)
>
> That's correct ? (is complicated ^^')
>
> Thanks a lot :o)
> Innop.
>
>
>
>
> > Message du 09/04/10 à 14h06
> > De : "Andrej Žbontar" <andrej.zbontar AT atnet DOT si>
> > A : innop AT voila DOT fr, "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
> > Copie à :
> > Objet : Re: [BackupPC-users] Full and Incrementals Backup question
> >
> > Try to read the documentations for* "IncrLevels"*,
> > I think it will be much easyer for you to understand the deal about
> > incrementals...
> >
> > ...Level 1 incremental, will back up all the files that changed since
> > the last full.
> >
> >
> > Andrej Žbontar
> >
> > ATNET d.o.o. Koper
> > Vojkovo  nabrežje 30a
> > 6000 Koper
> >
> > p.p. 251
> > 6001 Koper, SLOVENIJA
> >
> > GSM : + 386(0)40 435 058
> > Tel.: + 386(0)5 639 7223
> > Fax.: + 386(0)5 662 5893
> >
> > DDV ID: SI 95978232
> >
> > www.atnet.si
> >
> >
> >
> >
> >
> > On 9.4.2010 13:23, Inno wrote:
> > > Thanks.
> > >
> > > Ok I understand now for Full backup but with incremental I have :
> > >
> > > In CGI of BackupPC :
> > > FullPeriod : 7
> > > FullKeepCnt : 2
> > > IncrPeriod  : 1
> > > IncrKeepCnt : 8
> > >
> > > 9 - Full - 26/3
> > > 10 - DELETE by NightlyDaemon: incremental - 29/3
> > > 11 - incremental - 30/3
> > > 12 - incremental - 31/3
> > > 13 - incremental - 1/4
> > > 14 - Full - 2/4
> > > 15 - incremental - 4/4
> > > 16 - incremental - 5/4
> > > 17 - incremental - 6/4
> > > 18 - incremental - 7/4
> > > 19 - incremental - 8/4
> > >
> > > In this anormal case incremental of 29/3 has been deleted. Also incrementals of 30/3 to 1/4 not run ??
> > >
> > > Thanks.
> > >
> > >
> > >
> > >> Message du 09/04/10 à 10h15
> > >> De : "Tony Molloy" <tony.molloy AT ul DOT ie>
> > >> A : innop AT voila DOT fr, "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
> > >> Copie à :
> > >> Objet : Re: [BackupPC-users] Full and Incrementals Backup question
> > >>
> > >>
> > >> On Friday 09 April 2010 08:30:54 Inno wrote:
> > >>
> > >>> Hello,
> > >>>
> > >>> I need some help about incremental and full backup in BackupPC.
> > >>>
> > >>> Imagine this :
> > >>> Full max : 2
> > >>> Incremental max : 8
> > >>>
> > >>> 09/04/2010 : Full
> > >>> - weekend -
> > >>> 12/04/2010 : Incremental
> > >>> 13/04/2010 : Incremental
> > >>> 14/04/2010 : Incremental
> > >>> 15/04/2010 : Incremental
> > >>> 16/04/2010 : Full
> > >>> - weekend -
> > >>> 19/04/2010 : Incremental
> > >>> 20/04/2010 : Incremental
> > >>> 21/04/2010 : Incremental
> > >>> 22/04/2010 : Incremental
> > >>> 23/04/2010 : Full
> > >>> - weekend -
> > >>>
> > >>> But if I have 2 Full max, the full on 09/04/2010 is delete and incrementals
> > >>>  of 12/04/2010 to 15/04/2010 their unusable ? If the  incremental backup of
> > >>>  19/04/2010 have a problem, incrementals of 20/04/2010 to 22/04/2010 their
> > >>>  unusable ?
> > >>>
> > >> Doesn't work like that.
> > >>
> > >> A full backup is kept as long as any incremental backup depends on it. This is
> > >> no matter what you have "Full Max" set to. So the full of 09/04/2010 would be
> > >> kept until the incrememtal backup of 16/04/2010 is deleted.
> > >>
> > >> Then both the full of 09/04/2010 and the incremental of 16/04/2010 would be
> > >> deleted together.
> > >>
> > >> Tony
> > >>
> > >>> Thanks for your responses.
> > >>> Innop.
> > >>>
> > >>>
> > >>> ____________________________________________________
> > >>>
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> > >>>
> > >>>
> > >>>
> > >>>
> > >>> ---------------------------------------------------------------------------
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> > >
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> > >
> > > ------------------------------------------------------------------------------
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> > > proactively, and fine-tune applications for parallel performance.
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> > > _______________________________________________
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> > >
> >
>
> ____________________________________________________
>
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>
>
>
>
> ------------------------------------------------------------------------------
> Download Intel® Parallel Studio Eval
> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
> _______________________________________________
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