On Wed, 15 Nov 2017 21:59:28 -0000 Jamie Burchell <ja...@ib3.co.uk> wrote:
> Hi! Ho¡ > Hoping someone can give me that “ah ha!” moment that I’m so desperately > craving after pouring over the documentation, mailing lists and various > forum posts. Jiff chops a “ah ha!” moment from the (near) field, cooks it and => Jamie Burchell a hot “ah ha!” moment. > I want to move from BackupPC’s default schedule to keeping ~1 month’s > worth of backups, but I cannot fathom if I should: > - Do a full backup every day and keep 30 of them > - Do a full backup every week and keep 4 of them, with > incrementals in between > - Do a full backup each month and keep 30 incrementals. For what it's worth (I'm not a BPC specialist, just a doc reader), I keep several filled incrementals each day (~a month), plus some fulls every sunday (5, with the last of them a real SOS as it is extra-old.) This way, as incrementals looks complete (and fulls looks… full;), I just use the last backup, pick what I need and restore it when needed. > BackupPC is so efficient with storage and transferring only what is > needed between backups that I don’t understand the difference between > the three approaches. IIRC, fulls are unconditionally full backups, meaning they do not care about whatever took place formerly, meaning you either take disk place for nothing if you do one/day (links are cheap but not free in term of HD place.) > All backups can be browsed like full backups, Yep, but only if you said so, part of BPC black magic. > BackupPC only ever transfers files it doesn’t have, all storage is > deduplicated and rsync can detect changes, new files and deletions, so > why does it matter? All this takes time when an incremental take usually (much) less time (NB: we're NOT talking about very busy and large databases that have a short rotation of the whole rows here, just regular data.) > FullPeriod 6.97 > FullKeepCnt 4 > IncrPeriod 0.97 > IncrKeepCnt 24 > I **think** this will give me 4 full backups with incrementals in > between, but I think I could have equally have gone with: Looks correct. > FullPeriod 30 > FullKeepCnt 1 > IncrPeriod 0.97 > IncrKeepCnt 29 No, as it will keep more fulls than necessary. > I don’t understand what is meant by a “filled backup” either. Reading the doc helps, a lot. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ 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/
