In article <alpine.deb.2.21.2109211548140.20...@einstein.home.woodall.me.uk> 
you write:
>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).

Sorry to butt in, but I used to be a filesystem developer in a
previous life, working on archive storage for things like medical and
financial data. Pet peeve:

  WORM is Write *Once* , not Write *Only*

"Write only" storage is easy and fast - just throw things at /dev/null
and they can never be altered (or read back).

-- 
Steve McIntyre, Cambridge, UK.                                st...@einval.com
"We're the technical experts.  We were hired so that management could
 ignore our recommendations and tell us how to do our jobs."  -- Mike Andrews

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