Date: Sun, 3 Oct 2021 20:56:52 +0200 From: "Dr. Nikolaus Klepp" <office@klepp.biz> To: freebsd-questions@freebsd.org Subject: Re: zfs q regarding backup strategy Message-ID: <202110032056.52130.office@klepp.biz> In-Reply-To: <YVn6QkJ0sJK7rssb@ceres.zyxst.net> References: <YVZM1HnPuwIUQpah@ceres.zyxst.net> <eb164ac1-ddfe-feeb-03a9-507f643ec56d@holgerdanske.com> <YVn6QkJ0sJK7rssb@ceres.zyxst.net>
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Anno domini 2021 Sun, 3 Oct 19:45:22 +0100 tech-lists scripsit: > On Sun, Oct 03, 2021 at 02:46:47AM -0700, David Christensen wrote: > >On 10/2/21 16:21, tech-lists wrote: > > > >> OK. if I think I understand correctly then if we need to keep everything > >> then I'll need to keep every incremental snapshot. > > > > > >ZFS is novel and complex. It requires different thinking than > >traditional partitions/ slices, volumes, filesystems, etc.. > > Yep I hear you. Someone else mentioned bacula which keeps track of files > in a database. Maybe thats the path I'll need to go down. > > I'm looking for a recent (say from 2020 on) book about ZFS and OpenZFS > on FreeBSD with some worked examples. The Mastery books which I think > you mentioned earlier, the latest I can find is from 2016 and a lot has > happened to zfs in five years. It's a problem with all technology books > where the technology changes rapidly. > > I'm familiar with zfs for my own use. It's saved data from broken disks > several times. Just unfamiliar in this particilar use case: > > [1] offsite backup over ssh or tls > > [2] *all* changes to live site must be roll-backable [?] from backup, > for all time. If a file disappears from the live site I should be able > to restore it from backup. > > [3] backup must be searchable. Doesn't have to be searchable all the > time, it just has to be if something needs to be restored. > > Basically if the system gets set up, runs for a couple of years say. > Then I get asked to restore the site into the state it was a year and a > half ago. Then three months on from that restore point, restore it somewhere > else like another test system. I need to be able to do that reliably. > > But yeah, in the abscence of a book I really need to do testing. That's waht zfs allows you to do - well, if your disk is big enough to hold all snapshots :) Nik -- Please do not email me anything that you are not comfortable also sharing with the NSA, CIA ...
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