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Re: Recommendation: Backup system

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On Wed, Oct 05, 2016 at 03:06:58PM +1300, Richard Hector wrote:
> Can you elaborate on the performance issues? I'm using dirvish for my
> maildirs (dovecot imap server), without noticeable problems.

I don't know whether dirvish does something to improve matters, but with
hard link trees, if you have lots of little files (such as Maildir archives
of busy mailing lists like LKML), the amount of space consumed by the file
system metadata to represent the trees is very high, getting towards the
size used for the files themselves. This is compounded on some filesystems
(the ext family amongst them) that only ever increase the amount of space
for storing dirent metadata, never decrease it, so if you have a Maildir
which has high churn, and you move from having a large amount of mail to
a small amount, the storage allocated for metadata for the directory will
remain large.

On a low-powered device like an embedded NAS, performing operations like
delete (such as during a backup rotation) on a large hardlink tree can be
very slow and require a lot of CPU time.

> My current challenge is to back up windows boxes - if I can get rsync to
> work (maybe DeltaCopy? Not sure if that will work how I want), I guess
> I'll be stuck doing a local rsync of a smbfs mount ... unless someone
> has a better suggestion.

Windows has an rsync-like tool called Robocopy, but I'd skip straight to
Backup PC for backing up Windows machines.

-- 
Jonathan Dowland
Please do not CC me, I am subscribed to the list.

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Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 11:40 +0200
  Re: Recommendation: Backup system Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 14:50 +0200
    Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 15:10 +0200
    Re: Recommendation: Backup system Gene Heskett <gheskett@shentel.net> - 2016-10-01 18:30 +0200
      Re: Recommendation: Backup system Clive Menzies <clive@clivemenzies.co.uk> - 2016-10-01 18:50 +0200
        Re: Recommendation: Backup system Gene Heskett <gheskett@shentel.net> - 2016-10-01 19:50 +0200
          Re: Recommendation: Backup system Clive Menzies <clive@clivemenzies.co.uk> - 2016-10-01 20:00 +0200
            Re: Recommendation: Backup system Glenn English <ghe2001@gmail.com> - 2016-10-01 22:10 +0200
            Re: Recommendation: Backup system Gene Heskett <gheskett@shentel.net> - 2016-10-02 06:20 +0200
      Re: Recommendation: Backup system Glenn English <ghe2001@gmail.com> - 2016-10-01 22:00 +0200
        Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 22:50 +0200
      Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 22:40 +0200
  Re: Recommendation: Backup system Bob Weber <bobrweber@gmail.com> - 2016-10-01 16:50 +0200
    Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 17:10 +0200
    Re: Recommendation: Backup system Mark Fletcher <mark27q1@gmail.com> - 2016-10-01 17:40 +0200
  Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 17:20 +0200
  Re: Recommendation: Backup system Dan Purgert <dan@djph.net> - 2016-10-01 19:10 +0200
    Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 22:50 +0200
  Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-01 22:50 +0200
    Re: Recommendation: Backup system Bob Weber <bobrweber@gmail.com> - 2016-10-01 23:10 +0200
      Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-02 10:50 +0200
        Re: Recommendation: Backup system rhkramer@gmail.com - 2016-10-02 15:00 +0200
          Re: Recommendation: Backup system Bob Weber <bobrweber@gmail.com> - 2016-10-03 01:20 +0200
    Re: Recommendation: Backup system Dan Purgert <dan@djph.net> - 2016-10-02 03:00 +0200
      Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-02 11:00 +0200
        Re: Recommendation: Backup system Dan Purgert <dan@djph.net> - 2016-10-02 13:10 +0200
          Re: Recommendation: Backup system mo <mo777@gmx.net> - 2016-10-02 14:40 +0200
  Re: Recommendation: Backup system Jonathan Dowland <jmtd@debian.org> - 2016-10-03 11:50 +0200
    Re: Recommendation: Backup system Teemu Likonen <tlikonen@iki.fi> - 2016-10-03 14:40 +0200
      Re: Recommendation: Backup system Markus Grunwald <markus@the-grue.de> - 2016-10-03 14:50 +0200
        Re: Recommendation: Backup system Richard Hector <richard@walnut.gen.nz> - 2016-10-05 04:10 +0200
          Re: Recommendation: Backup system Daniel Bareiro <daniel-listas@gmx.net> - 2016-10-05 05:10 +0200
            Re: Recommendation: Backup system Richard Hector <richard@walnut.gen.nz> - 2016-10-05 23:40 +0200
          Re: Recommendation: Backup system Jonathan Dowland <jmtd@debian.org> - 2016-10-07 12:20 +0200
            Re: Recommendation: Backup system Richard Hector <richard@walnut.gen.nz> - 2016-10-12 12:10 +0200
      Re: Recommendation: Backup system Jonathan Dowland <jmtd@debian.org> - 2016-10-03 17:10 +0200
    Re: Recommendation: Backup system Celejar <celejar@gmail.com> - 2016-10-10 19:30 +0200
      Re: Recommendation: Backup system Jonathan Dowland <jmtd@debian.org> - 2016-10-11 00:00 +0200
        Re: Recommendation: Backup system Dave Thayer <debian1628420.dmthayer@recursor.net> - 2016-10-11 05:40 +0200
  Re: Recommendation: Backup system Jarle Aase <jgaa@jgaa.com> - 2016-10-04 20:50 +0200

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