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docs: quotas: clarify compatbility; only relevant to serve side 

also cf. "Enforcing the quota":

  The quota is enforcible only if *all* :ref:`borg_serve` versions
  accessible to clients support quotas
This commit is contained in:
Marian Beermann 2017-06-02 13:12:43 +02:00
parent 23d591c1c3
commit 089224975b
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7
docs/internals/data-structures.rst
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@ -233,8 +233,11 @@ state).
.. rubric:: Compatibility with older servers and enabling quota after-the-fact
If no quota data is stored in the hints file, Borg assumes zero quota is used.
Thus, if a repository with an enabled quota is written to with an older version
that does not understand quotas, then the quota usage will be erased.
Thus, if a repository with an enabled quota is written to with an older ``borg serve``
version that does not understand quotas, then the quota usage will be erased.
The client version is irrelevant to the storage quota and has no part in it.
The form of error messages due to exceeding quota varies with client versions.
A similar situation arises when upgrading from a Borg release that did not have quotas.
Borg will start tracking quota use from the time of the upgrade, starting at zero.