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On Tuesday, March 2nd, 2021 at 11:22, mj <[email protected]> wrote:
> Hi,
>
> Testing PBS backups taken from PVE VMs on ceph rbd now. Very nice, very
>
> quick, very cool. :-)
>
> We have a question. Something we wonder about.
>
> In our current backup software, we make weekly full_system backups, and
>
> daily incremental_system backups, each incremental based on the same
>
> full_system backup. So: each daily incremental backup becomes bigger,
>
> until the weekend. Then we make a new full_system backup to base the
>
> next set of incrementals on.
>
> In PBS I cannot specify if a backup is full or incremental, we assume
>
> this means that automatically the first backup is a full_system backup,
>
> and subsequent backups are incremental. The PBS backup logs confirm this
>
> assumption, saying: "scsi0: dirty-bitmap status: created new" vs "scsi0:
>
> dirty-bitmap status: OK (7.3 GiB of 501.0 GiB dirty)"
>
> And now the question: At what point in time is a new full_system backup
>
> created, to rebase incremental backups on?
>
> Or is each incremental backup based on the previous incremental? And if
>
> that is the case, how will we ever be able to delete one of the
>
> in-between incrementals, because that would then break to whole chain of
>
> incremental_backup-based-on-incremental_backup...?
>
> We have read the page
>
> https://qemu.readthedocs.io/en/latest/interop/bitmaps.html but it does
>
> not seem to answer this.
>
> Anyone care to share some insight on this logic and how PBS works?
>
> MJ
Accoring to the documentation every backup is a full backup and the data is
deduplicated.
There are no incrementals and the dirty-bitmap is just a optimization.
See https://pbs.proxmox.com/docs/faq.html#is-the-backup-incremental-deduplicated
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