I will upvote this answer if it is in stackoverflow :)
On Tue, Sep 23, 2014 at 1:19 AM, Bowie Bailey <bowie_bai...@buc.com> wrote:
> On 9/22/2014 2:33 AM, Sorin Srbu wrote:
> >> -----Original Message-----
> >> From: str...@hasnoname.de [mailto:str...@hasnoname.de]
> >> Sent: den 11 september 2014 12:14
> >> To: General list for user discussion, questions and support
> >> Subject: Re: [BackupPC-users] Long-Term Backups/Rotation
> >>
> >> wouldn't it be possible to do this with the exponential backup expiry
> >> like this:
> >>
> >> $Conf{FullPeriod} = 6,97
> >> $Conf{IncPeriod} = 0,97
> >> $Conf{FullKeepCnt} = [4,0,12,0,0,0,10]
> >>
> >> Would that give me:
> >> daily incrementals for a week,
> >> 4 weeks of full backups (1 full each week),
> >> 12 months (4*12 weeks) of full backups ( 1 full of each month),
> >> ~10 years (10*64 of backups ( 1 full of each year)
> >>
> >> Can anyone clarify this for me?
> > Was there ever a conclusion to this, or did I miss it?
>
> That looks pretty conclusive to me. What needs to be clarified.
>
> [4,0,12,0,0,0,10]
>
> 4 backups at 1 week
> 0 backups at 2 weeks
> 12 backups at 4 weeks
> 0 backups at 8 weeks
> 0 backups at 16 weeks
> 0 backups at 32 weeks
> 10 backups at 64 weeks
>
> The monthly backups are actually slightly less than a month. If you
> want a full year, you should do 13 of them.
>
> The yearly backups at 64 weeks are actually about 14.7 months apart, so
> they're not quite yearly. You could increase the number of monthly
> backups if you want full coverage or switch to 32-week backups instead.
>
> Keep in mind that due to pooling, backups do not take up nearly as much
> space as you expect (only enough to account for the changed files), so
> you will be able to keep many more backups than you think you can.
>
> --
> Bowie
>
>
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--
Sharuzzaman Ahmat Raslan
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