On 18.01.16 21:33, Les Mikesell wrote: > On Mon, Jan 18, 2016 at 12:25 PM, Alexander Moisseev > <mois...@mezonplus.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. ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
