mirror of
https://github.com/borgbackup/borg.git
synced 2024-12-24 08:45:13 +00:00
199 lines
No EOL
16 KiB
PHP
199 lines
No EOL
16 KiB
PHP
.. IMPORTANT: this file is auto-generated from borg's built-in help, do not edit!
|
|
|
|
.. _borg_check:
|
|
|
|
borg check
|
|
----------
|
|
.. code-block:: none
|
|
|
|
borg [common options] check [options]
|
|
|
|
.. only:: html
|
|
|
|
.. class:: borg-options-table
|
|
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| **options** |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--repository-only`` | only perform repository checks |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--archives-only`` | only perform archives checks |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--verify-data`` | perform cryptographic archive data integrity verification (conflicts with ``--repository-only``) |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--repair`` | attempt to repair any inconsistencies found |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--max-duration SECONDS`` | do only a partial repo check for max. SECONDS seconds (Default: unlimited) |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| .. class:: borg-common-opt-ref |
|
|
| |
|
|
| :ref:`common_options` |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| **Archive filters** — Archive filters can be applied to repository targets. |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``-a PATTERN``, ``--match-archives PATTERN`` | only consider archive names matching the pattern. see "borg help match-archives". |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--sort-by KEYS`` | Comma-separated list of sorting keys; valid keys are: timestamp, archive, name, id; default is: timestamp |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--first N`` | consider first N archives after other filters were applied |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--last N`` | consider last N archives after other filters were applied |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--oldest TIMESPAN`` | consider archives between the oldest archive's timestamp and (oldest + TIMESPAN), e.g. 7d or 12m. |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--newest TIMESPAN`` | consider archives between the newest archive's timestamp and (newest - TIMESPAN), e.g. 7d or 12m. |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--older TIMESPAN`` | consider archives older than (now - TIMESPAN), e.g. 7d or 12m. |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
| | ``--newer TIMESPAN`` | consider archives newer than (now - TIMESPAN), e.g. 7d or 12m. |
|
|
+-----------------------------------------------------------------------------+----------------------------------------------+-----------------------------------------------------------------------------------------------------------+
|
|
|
|
.. raw:: html
|
|
|
|
<script type='text/javascript'>
|
|
$(document).ready(function () {
|
|
$('.borg-options-table colgroup').remove();
|
|
})
|
|
</script>
|
|
|
|
.. only:: latex
|
|
|
|
|
|
|
|
options
|
|
--repository-only only perform repository checks
|
|
--archives-only only perform archives checks
|
|
--verify-data perform cryptographic archive data integrity verification (conflicts with ``--repository-only``)
|
|
--repair attempt to repair any inconsistencies found
|
|
--max-duration SECONDS do only a partial repo check for max. SECONDS seconds (Default: unlimited)
|
|
|
|
|
|
:ref:`common_options`
|
|
|
|
|
|
|
Archive filters
|
|
-a PATTERN, --match-archives PATTERN only consider archive names matching the pattern. see "borg help match-archives".
|
|
--sort-by KEYS Comma-separated list of sorting keys; valid keys are: timestamp, archive, name, id; default is: timestamp
|
|
--first N consider first N archives after other filters were applied
|
|
--last N consider last N archives after other filters were applied
|
|
--oldest TIMESPAN consider archives between the oldest archive's timestamp and (oldest + TIMESPAN), e.g. 7d or 12m.
|
|
--newest TIMESPAN consider archives between the newest archive's timestamp and (newest - TIMESPAN), e.g. 7d or 12m.
|
|
--older TIMESPAN consider archives older than (now - TIMESPAN), e.g. 7d or 12m.
|
|
--newer TIMESPAN consider archives newer than (now - TIMESPAN), e.g. 7d or 12m.
|
|
|
|
|
|
Description
|
|
~~~~~~~~~~~
|
|
|
|
The check command verifies the consistency of a repository and its archives.
|
|
It consists of two major steps:
|
|
|
|
1. Checking the consistency of the repository itself. This includes checking
|
|
the segment magic headers, and both the metadata and data of all objects in
|
|
the segments. The read data is checked by size and CRC. Bit rot and other
|
|
types of accidental damage can be detected this way. Running the repository
|
|
check can be split into multiple partial checks using ``--max-duration``.
|
|
When checking a remote repository, please note that the checks run on the
|
|
server and do not cause significant network traffic.
|
|
|
|
2. Checking consistency and correctness of the archive metadata and optionally
|
|
archive data (requires ``--verify-data``). This includes ensuring that the
|
|
repository manifest exists, the archive metadata chunk is present, and that
|
|
all chunks referencing files (items) in the archive exist. This requires
|
|
reading archive and file metadata, but not data. To cryptographically verify
|
|
the file (content) data integrity pass ``--verify-data``, but keep in mind
|
|
that this requires reading all data and is hence very time consuming. When
|
|
checking archives of a remote repository, archive checks run on the client
|
|
machine because they require decrypting data and therefore the encryption
|
|
key.
|
|
|
|
Both steps can also be run independently. Pass ``--repository-only`` to run the
|
|
repository checks only, or pass ``--archives-only`` to run the archive checks
|
|
only.
|
|
|
|
The ``--max-duration`` option can be used to split a long-running repository
|
|
check into multiple partial checks. After the given number of seconds the check
|
|
is interrupted. The next partial check will continue where the previous one
|
|
stopped, until the full repository has been checked. Assuming a complete check
|
|
would take 7 hours, then running a daily check with ``--max-duration=3600``
|
|
(1 hour) would result in one full repository check per week. Doing a full
|
|
repository check aborts any previous partial check; the next partial check will
|
|
restart from the beginning. With partial repository checks you can run neither
|
|
archive checks, nor enable repair mode. Consequently, if you want to use
|
|
``--max-duration`` you must also pass ``--repository-only``, and must not pass
|
|
``--archives-only``, nor ``--repair``.
|
|
|
|
**Warning:** Please note that partial repository checks (i.e. running it with
|
|
``--max-duration``) can only perform non-cryptographic checksum checks on the
|
|
segment files. A full repository check (i.e. without ``--max-duration``) can
|
|
also do a repository index check. Enabling partial repository checks excepts
|
|
archive checks for the same reason. Therefore partial checks may be useful with
|
|
very large repositories only where a full check would take too long.
|
|
|
|
The ``--verify-data`` option will perform a full integrity verification (as
|
|
opposed to checking the CRC32 of the segment) of data, which means reading the
|
|
data from the repository, decrypting and decompressing it. It is a complete
|
|
cryptographic verification and hence very time consuming, but will detect any
|
|
accidental and malicious corruption. Tamper-resistance is only guaranteed for
|
|
encrypted repositories against attackers without access to the keys. You can
|
|
not use ``--verify-data`` with ``--repository-only``.
|
|
|
|
About repair mode
|
|
+++++++++++++++++
|
|
|
|
The check command is a readonly task by default. If any corruption is found,
|
|
Borg will report the issue and proceed with checking. To actually repair the
|
|
issues found, pass ``--repair``.
|
|
|
|
.. note::
|
|
|
|
``--repair`` is a **POTENTIALLY DANGEROUS FEATURE** and might lead to data
|
|
loss! This does not just include data that was previously lost anyway, but
|
|
might include more data for kinds of corruption it is not capable of
|
|
dealing with. **BE VERY CAREFUL!**
|
|
|
|
Pursuant to the previous warning it is also highly recommended to test the
|
|
reliability of the hardware running Borg with stress testing software. This
|
|
especially includes storage and memory testers. Unreliable hardware might lead
|
|
to additional data loss.
|
|
|
|
It is highly recommended to create a backup of your repository before running
|
|
in repair mode (i.e. running it with ``--repair``).
|
|
|
|
Repair mode will attempt to fix any corruptions found. Fixing corruptions does
|
|
not mean recovering lost data: Borg can not magically restore data lost due to
|
|
e.g. a hardware failure. Repairing a repository means sacrificing some data
|
|
for the sake of the repository as a whole and the remaining data. Hence it is,
|
|
by definition, a potentially lossy task.
|
|
|
|
In practice, repair mode hooks into both the repository and archive checks:
|
|
|
|
1. When checking the repository's consistency, repair mode will try to recover
|
|
as many objects from segments with integrity errors as possible, and ensure
|
|
that the index is consistent with the data stored in the segments.
|
|
|
|
2. When checking the consistency and correctness of archives, repair mode might
|
|
remove whole archives from the manifest if their archive metadata chunk is
|
|
corrupt or lost. On a chunk level (i.e. the contents of files), repair mode
|
|
will replace corrupt or lost chunks with a same-size replacement chunk of
|
|
zeroes. If a previously zeroed chunk reappears, repair mode will restore
|
|
this lost chunk using the new chunk. Lastly, repair mode will also delete
|
|
orphaned chunks (e.g. caused by read errors while creating the archive).
|
|
|
|
Most steps taken by repair mode have a one-time effect on the repository, like
|
|
removing a lost archive from the repository. However, replacing a corrupt or
|
|
lost chunk with an all-zero replacement will have an ongoing effect on the
|
|
repository: When attempting to extract a file referencing an all-zero chunk,
|
|
the ``extract`` command will distinctly warn about it. The FUSE filesystem
|
|
created by the ``mount`` command will reject reading such a "zero-patched"
|
|
file unless a special mount option is given.
|
|
|
|
As mentioned earlier, Borg might be able to "heal" a "zero-patched" file in
|
|
repair mode, if all its previously lost chunks reappear (e.g. via a later
|
|
backup). This is achieved by Borg not only keeping track of the all-zero
|
|
replacement chunks, but also by keeping metadata about the lost chunks. In
|
|
repair mode Borg will check whether a previously lost chunk reappeared and will
|
|
replace the all-zero replacement chunk by the reappeared chunk. If all lost
|
|
chunks of a "zero-patched" file reappear, this effectively "heals" the file.
|
|
Consequently, if lost chunks were repaired earlier, it is advised to run
|
|
``--repair`` a second time after creating some new backups. |