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Re: Homebuilt NAS Advice

From rhkramer@gmail.com
Newsgroups linux.debian.user
Subject Re: Homebuilt NAS Advice
Date 2020-08-06 17:20 +0200
Message-ID <AAPQt-3GE-1@gated-at.bofh.it> (permalink)
References <Ay0p4-3Yf-3@gated-at.bofh.it> <AAL0A-KM-129@gated-at.bofh.it> <AAOKJ-342-3@gated-at.bofh.it>
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On Thursday, August 06, 2020 10:07:59 AM Celejar wrote:
> * Incremental and differential backups are backups of the delta between
> the last full backup and the current system state (either individually
> [differential] or collectively [incremental])

I am not Leslie Rhorer, I'm just coming out of left field, but I'd state the 
above a little differently (based on the reading about backups that I've done 
recently and past experiences).

Incremental and differential backups are similar in that neither are a full 
backup, they are a backup of the differences between two full images (or 
backups, or mirrors).

A differential backup (seemingly in the usage of most manufacturers) is a 
backup of the differences between two images but possibly not sequential 
images.  (For example, if somehow a backup image is created every day, a 
differential backup could be the differences between the image on say Monday and 
Thursday.)

In contrast (and again, seemingly in the usage of most manufacturers) is a 
backup of each image, for example, (in the example above), there would be an 
incremental backup of the differences between the Monday and Tuesday images, 
another incremental backup of the differences between the Tuesday and Wednesday 
images, and so on.
 
> * I have no idea (nor do Google, DuckDuckGo, or Wikipedia) what a
> "decremental backup" is.

Perhaps he means (I shouldn't put words in his mouth) a reverse backup?  
Forward backups of differences are those that list the changes to make an older 
image into a newer image.  You can do the reverse, and list the changes 
required to make a newer image into an older image.

Believe it or not, there are sometimes advantages to that approach, which I 
won't get into very deeply.    

But one is, if you do the backups in reverse, the corrolary to that is that, 
the current full image is the latest, and maybe the most likely to be needed.  
(Of course, it takes a little longer to arrange the backups in reverse.)

Another is, that if you want to get rid of older backups, that is fairly 
easily done by deleting the older differences.  In forward backups, if you want 
to get rid of older backups, you have to create a "new" old / base image.

There is more.









> 
> * Borg doesn't fit the "full / differential / incremental" paradigm
> neatly, but it certainly has some of the advantages of differential /
> incremental backups (plus others that classic differential /
> incremental ones do not have, such as deduplication - i.e., if the
> backup source contains multiple copies of some data, that dataonly
> needs to be stored once in the backup target).
> 
> * I don't know exactly what you mean by "deletion restoral", but Borg
> (and, I assume, many other good backup solutions) offers a
> flexible variety of methods to restore deleted files, and / or to
> restore a snapshot of the backup source as it existed at a given point
> in time: https://docs.borgbase.com/restore/
> 
> If you are willing to explain further, that would be appreciated.
> Thanks!
> 
> Celejar

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Thread

Homebuilt NAS Advice Patrick Bartek <patrick.bartek@gmail.com> - 2020-07-29 22:00 +0200
  Re: Homebuilt NAS Advice Dan Ritter <dsr@randomstring.org> - 2020-07-29 22:20 +0200
    Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-07-29 22:30 +0200
      Re: Homebuilt NAS Advice Dan Ritter <dsr@randomstring.org> - 2020-07-29 23:40 +0200
    Re: Homebuilt NAS Advice Patrick Bartek <patrick.bartek@gmail.com> - 2020-07-30 02:50 +0200
      Re: Homebuilt NAS Advice Tom Dial <tddial@comcast.net> - 2020-07-30 22:50 +0200
        Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-02 01:40 +0200
          Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-02 03:10 +0200
            Re: Homebuilt NAS Advice Keith Bainbridge <ke1th3216@gmail.com> - 2020-08-02 04:50 +0200
              Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-02 06:10 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-02 21:30 +0200
            Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-02 22:10 +0200
          Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-03 06:10 +0200
            Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-03 17:30 +0200
              Re: Homebuilt NAS Advice Dan Ritter <dsr@randomstring.org> - 2020-08-03 17:40 +0200
              Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-03 18:40 +0200
                Re: Homebuilt NAS Advice <tomas@tuxteam.de> - 2020-08-03 19:10 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-03 22:00 +0200
                Re: Homebuilt NAS Advice <tomas@tuxteam.de> - 2020-08-03 22:20 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-03 23:50 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-04 00:50 +0200
            Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-04 00:40 +0200
    Re: Homebuilt NAS Advice Anssi Saari <as@sci.fi> - 2020-07-30 10:00 +0200
      Re: Homebuilt NAS Advice rhkramer@gmail.com - 2020-07-30 13:20 +0200
  Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-07-30 01:50 +0200
    Re: Homebuilt NAS Advice Patrick Bartek <nemommxiv@gmail.com> - 2020-07-30 23:40 +0200
    Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-08 01:30 +0200
      Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-08 03:30 +0200
        Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-09 14:40 +0200
  Re: Homebuilt NAS Advice Peter Ehlert <peter@sdi-baja.com> - 2020-07-30 19:00 +0200
    Re: Homebuilt NAS Advice Charles Curley <charlescurley@charlescurley.com> - 2020-07-30 21:50 +0200
      Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-07-31 13:10 +0200
    Re: Homebuilt NAS Advice Patrick Bartek <nemommxiv@gmail.com> - 2020-07-30 23:30 +0200
      Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-02 01:50 +0200
        Re: Homebuilt NAS Advice Patrick Bartek <nemommxiv@gmail.com> - 2020-08-02 17:50 +0200
  Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-03 17:20 +0200
    Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-04 00:10 +0200
      Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-04 01:20 +0200
        Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-04 10:40 +0200
          Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-04 11:30 +0200
            Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-04 16:00 +0200
              Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-04 16:30 +0200
              Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-05 05:50 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-05 16:20 +0200
                Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-05 17:00 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-05 17:40 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 12:10 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-06 16:10 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 17:10 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-06 18:10 +0200
                Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-07 18:30 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-07 19:40 +0200
                Re: Homebuilt NAS Advice rhkramer@gmail.com - 2020-08-08 00:10 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-09 04:30 +0200
                Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-09 11:10 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-09 17:00 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-09 18:30 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-09 19:20 +0200
                Re: Homebuilt NAS Advice rhkramer@gmail.com - 2020-08-09 23:50 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-10 00:00 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-10 00:30 +0200
                Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-10 00:50 +0200
                Re: Homebuilt NAS Advice rhkramer@gmail.com - 2020-08-10 00:30 +0200
                Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-10 00:30 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-09 18:40 +0200
                Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-09 23:00 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-06 18:20 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 05:30 +0200
                Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-07 18:30 +0200
                Re: Homebuilt NAS Advice rhkramer@gmail.com - 2020-08-06 17:20 +0200
                Re: Homebuilt NAS Advice Celejar <celejar@gmail.com> - 2020-08-06 18:20 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-06 18:20 +0200
        Re: Homebuilt NAS Advice Andrei POPESCU <andreimpopescu@gmail.com> - 2020-08-04 17:20 +0200
          Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-05 06:20 +0200
        Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-05 04:30 +0200
          Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-05 09:20 +0200
            Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-05 11:00 +0200
              Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-05 21:00 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 03:50 +0200
                Re: Homebuilt NAS Advice Kushal Kumaran <kushal@locationd.net> - 2020-08-06 06:20 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-06 18:20 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 04:10 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-07 05:50 +0200
            Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-05 12:30 +0200
      Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-05 12:30 +0200
        Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-05 21:10 +0200
          Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-05 23:30 +0200
            Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-06 00:30 +0200
              Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 01:20 +0200
                Re: Homebuilt NAS Advice Jonathan Dowland <jon+debian-user@dow.land> - 2020-08-08 09:10 +0200
              Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-06 04:30 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 04:50 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-06 06:20 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 07:10 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-06 07:30 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-06 18:10 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-06 18:30 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 03:00 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-07 03:20 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 05:00 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-07 05:40 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 08:00 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-07 08:50 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-07 09:10 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-07 17:50 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-08 01:40 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-08 04:50 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-08 22:30 +0200
                Re: Homebuilt NAS Advice Stefan Monnier <monnier@iro.umontreal.ca> - 2020-08-09 00:20 +0200
                Re: Homebuilt NAS Advice deloptes <deloptes@gmail.com> - 2020-08-09 01:30 +0200
                Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-09 22:40 +0200
                Re: Homebuilt NAS Advice David Christensen <dpchrist@holgerdanske.com> - 2020-08-10 00:30 +0200
                Re: Homebuilt NAS Advice Leslie Rhorer <lesrhorer@att.net> - 2020-08-10 01:30 +0200
    Re: Homebuilt NAS Advice Patrick Bartek <nemommxiv@gmail.com> - 2020-08-04 06:30 +0200

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