On 9/22/2014 2:33 AM, Sorin Srbu wrote:
>> -----Original Message-----
>> From: strowi AT hasnoname DOT de [mailto:strowi AT hasnoname DOT 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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