The issue with the --reference solution is that it will still remove Posix ACLs, xattrs, etc. and we cannot replicate everything. Not touching file metadata (except for mtime) resolves that and thus is the only universal solution.
-nik -- Dominik George (Vorstandsvorsitzender, Pädagogischer Leiter) Teckids e.V. - Erkunden, Entdecken, Erfinden. https://www.teckids.org
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