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docs: add note about metadata dedup and --no[ac]time, fixes #2518 

(cherry picked from commit d8766df998)
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Thomas Waldmann 2017-09-22 23:08:33 +02:00
parent b6abee4d68
commit eacea02d8c
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docs/usage/notes.rst
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@ -50,6 +50,17 @@ a new repository when changing chunker params.
For more details, see :ref:`chunker_details`.
``--noatime / --noctime``
~~~~~~~~~~~~~~~~~~~~~~~~~
You can use these ``borg create`` options to not store the respective timestamp
into the archive, in case you do not really need it.
Besides saving a little space for the not archived timestamp, it might also
affect metadata stream deduplication: if only this timestamp changes between
backups and is stored into the metadata stream, the metadata stream chunks
won't deduplicate just because of that.
``--umask``
~~~~~~~~~~~