BackupPC-users

Re: [BackupPC-users] how to have 1 full backup + incrementals forever?

2009-10-21 15:47:26
Subject: Re: [BackupPC-users] how to have 1 full backup + incrementals forever?
From: Tony Molloy <tony.molloy AT ul DOT ie>
To: "General list for user discussion, questions and support" <backuppc-users AT lists.sourceforge DOT net>
Date: Wed, 21 Oct 2009 20:41:31 +0100
On Wednesday 21 October 2009 15:35:20 Tyler J. Wagner wrote:
> On Wednesday 21 October 2009 15:11:41 Adam Williams wrote:
> > If I wanted to change my schedule so that I'd keep 6 weeks of dailies, 8
> > weeks of 2 week periods, 13 periods of 4 weeks, 0 8 weeks, 16 of 16
> > weeks, and delete them after they age 1825 days, then all i'd need to do
> > is change
> >
> >
> > $Conf{FullKeepCnt} = ['6','8','13','0','16'];
> > $Conf{FullKeepCntMin} = '16';
>
> That is correct.  But you'd also want to adjust the IncrKeepCnt to 8*6 =
> 42, to keep those dailies.
>
> Regards,
> Tyler

Not quite!!

Assuming the following
#    Full backup every week
$Conf{FullPeriod} = 6.97;

Then
$Conf{FullKeepCnt} = ['6','8','13','0','16'];

keeps            6 full backups at weekly intervals ( 6.97 days or 1 week )
                      8 full backups at 2 weekly intervals ( 1 week x 2 )
                    13 full backups at 4 weekly intervals ( 1 week x 4)
                      0 full backups at 8 weekly intervals ( 1 week x 8 )
and              16 full backups at16 weekly intervals ( 1 week x 16 )

So the first element in the array is the FullPeriod the second is the 
FullPeriod x 2 the third is the Full Period x 4 and so on.

So that would keep the following Full backups in weeks.

1 2 3 4 5 6 8 10 12 14 16 18 20 22 24 28 32 36 ....
 
6                 8                                       13

Hope this helps,

Tony
-- 

Dept. of Comp. Sci.
University of Limerick.

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