Author: Syeed Ali Date: To: dng Subject: Re: [DNG] Long-term archiving versus medium fallibility
On Mon, 1 Nov 2021 08:11:54 -0400
Hendrik Boom <hendrik@???> wrote:
> Yet these files are also working files, are kept online, and
> legitinately need to be modified from time to time. > My present method is to keep everything on my server, and make
> regular backups.
My first suggestion is to decide why you're keeping everything
together. Perhaps there needs to be a separation between
Convenience; everything in one place (and subject to the same
procedures, benefits and flaws)
Confidence; some things subject to enhanced archival techniques or
media, such as using M-DISC 
Perhaps there does not need to be a separation. Maybe the effort is
too high or the reward is not great enough. Make this decision.
Maybe unchanging media, such as your media archives (photographs,
video, poetry) can be on M-DISC locally, with a second copy offsite.
Thinking about M-DISC and changes, it makes me wonder if multi-track /
multi-session technology  is available to them. This would allow
the appending of data to either add more files, or "modify" existing
files (versioning in a sense).
> Currently I use rdiff-backup, which does have the ablity to keep
> older as well as newer versions of files on the same backup drive.
Does rdiff-backup have the ability to keep older versions on different
storage? If so, you could shunt those data to a more reliable medium.
It would also save you space for your "live" data, giving some
side-benefits like reduced cost.
> Now storage media deteriorate over time.
> It is necessary to read and transfer data from old media to new from
> time to time.
If these things can be solved or made less difficult, it would help
alleviate a lot of pressure on the rest of your backups. This is why I
suggested M-DISC 
As for your other thoughts, I have no experience. Regarding
filesystems, I think it was ZFS that you mean.