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Date:      Mon, 30 Sep 2024 11:56:28 +0000
From:      "Dave Cottlehuber" <dch@skunkwerks.at>
To:        "Frank Leonhardt" <freebsd-doc@fjl.co.uk>
Cc:        freebsd-questions <freebsd-questions@freebsd.org>
Subject:   Re: Manual upgrade using base.txz
Message-ID:  <7df6784b-c240-4f41-8e6d-61f01008f373@app.fastmail.com>
In-Reply-To: <73ea4e68084aaef706787425ab17f023@fjl.co.uk>
References:  <573b9b4c7f56702619bbb77e9a8c0a77@fjl.co.uk> <a53a0d18-8ed2-4341-acdf-1bca95192c6e@app.fastmail.com> <73ea4e68084aaef706787425ab17f023@fjl.co.uk>

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On Thu, 26 Sep 2024, at 14:37, Frank Leonhardt wrote:
> you any idea how far back this might work? Like dumping 14 on a 
> ten-year-old AMD64 install? I can, of course, copy the drives and 
> experiment if no one else has.

I would expect the password files not to be directly compatible, and
probably a few other things like sshd_config would be out of date too.

Either way I think you should have a crack and report back just how
bad the breakage is :-). 

10 years ago would be 9.x approx, a great deal has changed, hopefully
for the better. The zfs pool layout is different now too, IIRC, so
boot environments might not work OOTB.

I would be concerned about being easily able to revert, for example.

You could test the waters by installing 14.1-RELEASE onto a USB stick
or external drive, and seeing if you can use that boot loader, to
boot the older version or not.

good luck!

A+
Dave



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