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".

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