Greetings,
when the daily system backup with rsync is performed, thousands of files (e.g.
from /usr directory),
which are not modified are uselessly transferrred to the backup storage every
day.
The rsync command is the following:
rsync --update -DHAErlptgo --relative --atimes --delete-during ${SRCPATH}
${BACKUPDIR}
Quick investigation shown, that these files are hard links, and the command
option related to this
behaviour is -H: without it the unmodified files are not copied. Seemingly this
situation is described
in the rsync manual:
"If incremental recursion is active (see --recursive), rsync may transfer a
missing
hard-linked file before it finds that another link for that contents exists
else‐
where in the hierarchy.... One way to avoid this inefficiency is to
disable
incremental recursion using the --no-inc-recursive option."
Adding --no-inc-recursive to the aforementioned command line doesn't help (are
--recursive and
--no-inc-recursive supposed to be used in one option set?). And I use
--recursive to copy entire
directory tree, including subdirectories. Could someone advise please how one
can prevent copying
unmodified hard-linked files?
Thanks,
A. Berger.
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