Looks good to me. mph
> On Feb 13, 2020, at 8:44 AM, Guillermo Rozas <guille2...@gmail.com> wrote: > > Yes. In your setup all the incremental-unfilled are deltas with > respect to the last incremental-filled (see the level column). And if > you delete the last incremental (which is filled, level 0), the system > will fill the previous one and refer all the others to it, so you > never end with a broken chain. > > From the documentation > (https://backuppc.github.io/backuppc/BackupPC.html#Overview): > - Backups are stored as "reverse deltas" - the most recent backup is > always filled and older backups are reconstituted by merging all the > deltas starting with the nearest future filled backup and working > backwards. > - Since the most recent backup is filled, viewing/restoring that > backup (which is the most common backup used) doesn't require merging > any deltas from other backups. > - The concepts of incr/full backups and unfilled/filled storage are > decoupled. The most recent backup is always filled. By default, for > the remaining backups, full backups are filled and incremental backups > are unfilled, but that is configurable. > - Any backup can be deleted (deltas are merged into next older backup > if it is not filled). > - The reverse deltas allow "infinite incrementals" - no need for a > full backup if you are willing to trade speed for the risk that a file > change will not be detected if the metadata (eg, mtime or size) > doesn't change. > > Regards, > Guillermo > >> On Thu, Feb 13, 2020 at 1:14 PM Gandalf Corvotempesta >> <gandalf.corvotempe...@gmail.com> wrote: >> >> So, this is a perfectly working system: >> https://postimg.cc/PCZgN634 >> >> with *ALL* backups available totally ? >> I'll be able to restore *any* file from *any* backup , in example, >> even from the #18 ? >> >>> Il giorno gio 13 feb 2020 alle ore 16:07 Michael Huntley >>> <mich...@huntley.net> ha scritto: >>> >>> Hi Gandalf, >>> >>> Not with v4. V4 uses reverse deltas, so your most recent backup is a >>> filled, or complete backup. >>> >>> V4 calculates the difference between today and yesterday, and so on >>> backwards. Just think of it as incrementals going back in time and >>> carrying your full with you each day. You have a full basket of goodies >>> each day and leave a trail behind you. >>> >>> You can also have older filled backups to reduce restore time as it lessens >>> the calculations BackupPC must perform. >>> >>> So, if you have a complete trail of incrementals going back two weeks there >>> is no data loss in that time period. >>> >>> If I am incorrect in any way in my analogy I am sure the list will correct >>> me and we will both learn. >>> >>> Kind regards, >>> >>> mph >>> >>>> On Feb 13, 2020, at 3:49 AM, Gandalf Corvotempesta >>>> <gandalf.corvotempe...@gmail.com> wrote: >>>> >>>> Just a confirm: >>>> >>>> if I have a full backup done on 2020-01-14 (doing 1 full each month) >>>> and daily incrementals, keeping up to 14 incrementals, I have data >>>> loss ? >>>> >>>> In example, the incremental done yesterday (2020-02-12), is relative >>>> to the incremental done on 2020-01-14 ? >>>> >>>> How does it work, exactly ? I have some "broken chain" ? >>>> >>>> With bacula, in example, I need at least 1 full backup and then each >>>> incremental after it, to restore from yesterday. When using >>>> differentials, I need 1 full, all differential, and all incrementals >>>> >>>> >>>> _______________________________________________ >>>> 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/ >>>> >>> >>> >>> >>> _______________________________________________ >>> 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/ >> >> >> _______________________________________________ >> 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/ > > > _______________________________________________ > 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/ _______________________________________________ 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/
