mirror of https://github.com/borgbackup/borg.git
143 lines
15 KiB
PHP
143 lines
15 KiB
PHP
.. IMPORTANT: this file is auto-generated from borg's built-in help, do not edit!
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.. _borg_check:
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borg check
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----------
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.. code-block:: none
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borg [common options] check [options] [REPOSITORY_OR_ARCHIVE]
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.. only:: html
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.. class:: borg-options-table
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| **positional arguments** |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``REPOSITORY_OR_ARCHIVE`` | repository or archive to check consistency of |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| **optional arguments** |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--repository-only`` | only perform repository checks |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--archives-only`` | only perform archives checks |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--verify-data`` | perform cryptographic archive data integrity verification (conflicts with ``--repository-only``) |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--repair`` | attempt to repair any inconsistencies found |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--save-space`` | work slower, but using less space |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--max-duration SECONDS`` | do only a partial repo check for max. SECONDS seconds (Default: unlimited) |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| .. class:: borg-common-opt-ref |
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| :ref:`common_options` |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| **Archive filters** — Archive filters can be applied to repository targets. |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``-P PREFIX``, ``--prefix PREFIX`` | only consider archive names starting with this prefix. |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``-a GLOB``, ``--glob-archives GLOB`` | only consider archive names matching the glob. sh: rules apply, see "borg help patterns". ``--prefix`` and ``--glob-archives`` are mutually exclusive. |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--sort-by KEYS`` | Comma-separated list of sorting keys; valid keys are: timestamp, name, id; default is: timestamp |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--first N`` | consider first N archives after other filters were applied |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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| | ``--last N`` | consider last N archives after other filters were applied |
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+-----------------------------------------------------------------------------+---------------------------------------+--------------------------------------------------------------------------------------------------------------------------------------------------------+
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.. raw:: html
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<script type='text/javascript'>
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$(document).ready(function () {
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$('.borg-options-table colgroup').remove();
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})
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</script>
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.. only:: latex
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REPOSITORY_OR_ARCHIVE
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repository or archive to check consistency of
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optional arguments
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--repository-only only perform repository checks
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--archives-only only perform archives checks
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--verify-data perform cryptographic archive data integrity verification (conflicts with ``--repository-only``)
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--repair attempt to repair any inconsistencies found
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--save-space work slower, but using less space
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--max-duration SECONDS do only a partial repo check for max. SECONDS seconds (Default: unlimited)
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:ref:`common_options`
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Archive filters
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-P PREFIX, --prefix PREFIX only consider archive names starting with this prefix.
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-a GLOB, --glob-archives GLOB only consider archive names matching the glob. sh: rules apply, see "borg help patterns". ``--prefix`` and ``--glob-archives`` are mutually exclusive.
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--sort-by KEYS Comma-separated list of sorting keys; valid keys are: timestamp, name, id; default is: timestamp
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--first N consider first N archives after other filters were applied
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--last N consider last N archives after other filters were applied
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Description
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~~~~~~~~~~~
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The check command verifies the consistency of a repository and the corresponding archives.
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First, the underlying repository data files are checked:
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- For all segments the segment magic (header) is checked
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- For all objects stored in the segments, all metadata (e.g. crc and size) and
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all data is read. The read data is checked by size and CRC. Bit rot and other
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types of accidental damage can be detected this way.
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- If we are in repair mode and a integrity error is detected for a segment,
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we try to recover as many objects from the segment as possible.
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- In repair mode, it makes sure that the index is consistent with the data
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stored in the segments.
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- If you use a remote repo server via ssh:, the repo check is executed on the
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repo server without causing significant network traffic.
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- The repository check can be skipped using the ``--archives-only`` option.
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- A repository check can be time consuming. Partial checks are possible with the ``--max-duration`` option.
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Second, the consistency and correctness of the archive metadata is verified:
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- Is the repo manifest present? If not, it is rebuilt from archive metadata
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chunks (this requires reading and decrypting of all metadata and data).
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- Check if archive metadata chunk is present. if not, remove archive from
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manifest.
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- For all files (items) in the archive, for all chunks referenced by these
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files, check if chunk is present.
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If a chunk is not present and we are in repair mode, replace it with a same-size
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replacement chunk of zeros.
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If a previously lost chunk reappears (e.g. via a later backup) and we are in
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repair mode, the all-zero replacement chunk will be replaced by the correct chunk.
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This requires reading of archive and file metadata, but not data.
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- If we are in repair mode and we checked all the archives: delete orphaned
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chunks from the repo.
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- if you use a remote repo server via ssh:, the archive check is executed on
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the client machine (because if encryption is enabled, the checks will require
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decryption and this is always done client-side, because key access will be
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required).
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- The archive checks can be time consuming, they can be skipped using the
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``--repository-only`` option.
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The ``--max-duration`` option can be used to split a long-running repository check into multiple partial checks.
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After the given number of seconds the check is interrupted. The next partial check will continue where the
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previous one stopped, until the complete repository has been checked. Example: Assuming a full check took 7
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hours, then running a daily check with --max-duration=3600 (1 hour) would result in one full check per week.
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Attention: Partial checks can only do way less checks than a full check (only the CRC32 checks on segment file
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entries are done) and cannot be combined with ``--repair``. Partial checks may therefore be useful only with very
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large repositories where a full check would take too long. Doing a full repository check aborts a partial check;
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the next partial check will start from the beginning.
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The ``--verify-data`` option will perform a full integrity verification (as opposed to
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checking the CRC32 of the segment) of data, which means reading the data from the
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repository, decrypting and decompressing it. This is a cryptographic verification,
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which will detect (accidental) corruption. For encrypted repositories it is
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tamper-resistant as well, unless the attacker has access to the keys.
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It is also very slow. |