On Thu, Aug 31, 2017 at 10:23 AM, Gandalf Corvotempesta <
gandalf.corvotempe...@gmail.com> wrote:
>
>
> So, with a "full" run, the second "full" is still seen as an
> incremental by rsync?
> Let's assume a 100GB host.
> bpc will backup that host for the first time. 100GB are transferred.
> The next day, only 5GB are added on that host. i'll force bpc to make
> a "full/filled" backup.
> How many GB are transferred, 105GB or only 5GB ?
>
I'll extend the example
Day 0 : Full backup 100GB transfered
Day 1 : add 5GB , Incremental runs, 5GB transferred
Day 2 : add 5GB , Incremental, ~5GB transferred
Day 3 ; add 5 GB, Full runs. ALL files check-summed. Files with
identical checksum are skipped, new/changed files transferred: ~ 5GB
You do incur extra TIME related to checksumming all the files, but
you only transfer what's changed/new
>
> > With BackupPC 4.x if you delete a 'filled' backup (why would you do that
> > anyway?) It just makes BackupPC work harder since it has to rebuild
> > references back to an older filled backup, which cost time while doing a
> > restore. So you'll only lose the single day that you delete.
>
> And what If I don't have any other filled backup but only incrementals
> made from the deleted "filled" ?
BackupPC requires a minimum of one filled backup. If you gracefully
delete a filled backup, I believe that BackupPC does intelligently fill the
next backup. If you were to delete the filled backup from the filesystem
directly, It is simply missing, and BackupPC would have to build a restore
tree referencing all of the available incrementals back to the most recent
available filled backup.
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