On 18.01.16 21:33, Les Mikesell wrote:
> On Mon, Jan 18, 2016 at 12:25 PM, Alexander Moisseev
> <moiseev AT mezonplus DOT ru> wrote:
>> On 18.01.16 19:53, Les Mikesell wrote:
>>> Does anyone understand the docs at
>>> http://backuppc.sourceforge.net/BackupPC-4.0.0alpha3_doc.html
>>> for $Conf{FillCycle} ?   It looks like expiring is really based on
>>> 'filled' backups, not necessarily full backups as in v3.  The part I
>>> don't get is that it says the most recent backup is always filled
>>> whether it is full or incremental.  If the most recent is filled, how
>>> would any ever be unfilled?
>>>
>>
>> In v4 full/incremental related to backup transfer only, filled/unfilled 
>> related to storage.
>>
>> Here is a short explanation:
>> http://backuppc.sourceforge.net/BackupPC-4.0.0alpha3_doc.html#BackupPC-4.0
>>
>> "Backups are stored as "reverse deltas" - the most recent backup is always 
>> filled and older backups are reconstitued by merging all the deltas starting 
>> with the nearest future filled backup and wworking backwards.
>>
>> This is the opposite of V3 where incrementals are stored as "forward deltas" 
>> to a prior backup (typically the last full backup or prior lower-level 
>> incremental backup, or the last full in the case of rsync)."
>>
>>
>> So, the latest backup should always be filled, i.e. it actually contains all 
>> files.  After the last backup will be taken, files that latest backup 
>> contains will be removed from backups between the last backup and previous 
>> filled backup recursively. Until the last backup was taken, previous backup 
>> was filled, but now it is just "reverse delta".
>
> OK, but then how does that relate to the expiring part - which it says
> is really based on the filled status?
>

v3: 'full'   shouldn't be expired while there is at least one 'incremental' 
that depends on it
v4: 'filled' shouldn't be expired while there is at least one 'unfilled'    
that depends on it

Full/incremental doesn't matter for v4 expiration algorithm since it doesn't 
affect ability to restore particular backup.


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