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Re: write only storage.

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On 21.09.21 17:53, Tim Woodall wrote:
> I would like to have some WORM memory for my backups. At the moment
> they're copied to an archive machine using a chrooted unprivileged user
> and then moved via a cron job so that that user cannot delete them
> (other than during a short window).
> 
> My though was to use a raspberry-pi4 to provide a USB mass storage
> device that is modified to not permit deleting. If the pi4 is not
> accessible via the network then other than bugs in the mass storage API
> it should be impossible to delete things without physical access to the
> pi.
> 
> Before I start reinventing the wheel, does anyone know of anything
> similar to this already in existence?
> 
> Things like chattr don't achieve what I want as root can still override
> that. I'm looking for something that requires physical access to delete.
> 
> 

The backup tool borg, or borgbackup (this latter is also the package 
name in the Debian repository), has an option to create backup archives 
to which only data can be added but not deleted. If you can get it 
managed, that only borgbackup has access through the network to the 
backup system but no other user can access the backup system from the 
network, then this might be want you want.
Borgbackup appears to be quite professionally designed. I have never had 
bad experience for my usage scenario backing up several home and data 
directories with it and restoring data from the archives - luckily 
restoring data just for testing the archives but not for indeed having 
needed data from a backup. My impression is, that this tool is also in 
use by the big professionals, those who have to keep up and running a 
real big business. Well, maybe someone of those borgbackup users with 
the big business pressure and experience should comment on this and not 
me. At least for me and my laboratory measurement data distributed on 
still less than 10 computers and all together comprising still less than 
10 TB data volume, it is the perfect tool. Your question sounds like it 
could also fit your needs.

Best wishes,
Marco

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Thread

write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 18:10 +0200
  Re: write only storage. Toni Mas Soler <antomassol@protonmail.com> - 2021-09-21 18:30 +0200
    Re: write only storage. "Andrew M.A. Cater" <amacater@einval.com> - 2021-09-21 19:10 +0200
      Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 19:40 +0200
        Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-21 20:50 +0200
        Re: write only storage. Michael Stone <mstone@debian.org> - 2021-09-21 22:10 +0200
        Re: write only storage. Stefan Monnier <monnier@iro.umontreal.ca> - 2021-10-01 17:10 +0200
      Unclosed DVD-R or BD-R sessions ? was: Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-21 20:50 +0200
    Re: write only storage. Michael Stone <mstone@debian.org> - 2021-09-21 19:10 +0200
  Write *once* storage (was Re: write only storage) Steve McIntyre <steve@einval.com> - 2021-09-21 19:30 +0200
    Re: Write *once* storage (was Re: write only storage) "James H. H. Lampert" <jamesl@touchtonecorp.com> - 2021-09-21 19:40 +0200
    Re: Write *once* storage (was Re: write only storage) Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2021-09-22 01:30 +0200
  Re: write only storage. Marco Möller <talby@debianlists.mobilxpress.net> - 2021-09-21 19:30 +0200
    Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-21 19:50 +0200
    Re: write only storage. Linux-Fan <Ma_Sys.ma@web.de> - 2021-09-21 21:50 +0200
    Re: write only storage. Marco Möller <talby@debianlists.mobilxpress.net> - 2021-09-22 18:20 +0200
  Re: write only storage. David Christensen <dpchrist@holgerdanske.com> - 2021-09-22 06:20 +0200
    Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-22 10:10 +0200
      Re: write only storage. "Thomas Schmitt" <scdbackup@gmx.net> - 2021-09-22 12:30 +0200
        Re: write only storage. Tim Woodall <debianuser@woodall.me.uk> - 2021-09-22 16:40 +0200
      Re: write only storage. David Christensen <dpchrist@holgerdanske.com> - 2021-09-23 01:00 +0200

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