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.TH "BORG-UPGRADE" "1" "2025-12-01" "" "borg backup tool"
.SH NAME
borg-upgrade \- upgrade a repository from a previous version
.SH SYNOPSIS
.sp
borg [common options] upgrade [options] [REPOSITORY]
.SH DESCRIPTION
.sp
Upgrade an existing, local Borg repository.
.SS When you do not need borg upgrade
.sp
Not every change requires that you run \fBborg upgrade\fP\&.
.sp
You do \fBnot\fP need to run it when:
.INDENT 0.0
.IP \(bu 2
moving your repository to a different place
.IP \(bu 2
upgrading to another point release (like 1.0.x to 1.0.y),
except when noted otherwise in the changelog
.IP \(bu 2
upgrading from 1.0.x to 1.1.x,
except when noted otherwise in the changelog
.UNINDENT
.SS Borg 1.x.y upgrades
.sp
Archive TAM authentication:
.sp
Use \fBborg upgrade \-\-archives\-tam REPO\fP to add archive TAMs to all
archives that are not TAM authenticated yet.
This is a convenient method to just trust all archives present \- if
an archive does not have TAM authentication yet, a TAM will be added.
Archives created by old borg versions < 1.0.9 do not have TAMs.
Archives created by newer borg versions should have TAMs already.
If you have a high\-risk environment, you should not just run this,
but first verify that the archives are authentic and not malicious
(== have good content, have a good timestamp).
Borg 1.2.5+ needs all archives to be TAM authenticated for safety reasons.
.sp
This upgrade needs to be done once per repository.
.sp
Manifest TAM authentication:
.sp
Use \fBborg upgrade \-\-tam REPO\fP to require manifest authentication
introduced with Borg 1.0.9 to address security issues. This means
that modifying the repository after doing this with a version prior
to 1.0.9 will raise a validation error, so only perform this upgrade
after updating all clients using the repository to 1.0.9 or newer.
.sp
This upgrade should be done on each client for safety reasons.
.sp
If a repository is accidentally modified with a pre\-1.0.9 client after
this upgrade, use \fBborg upgrade \-\-tam \-\-force REPO\fP to remedy it.
.sp
If you routinely do this you might not want to enable this upgrade
(which will leave you exposed to the security issue). You can
reverse the upgrade by issuing \fBborg upgrade \-\-disable\-tam REPO\fP\&.
.sp
See
 <https://borgbackup.readthedocs.io/en/stable/changes.html#pre\-1\-0\-9\-manifest\-spoofing\-vulnerability> 
for details.
.SS Attic and Borg 0.xx to Borg 1.x
.sp
This currently supports converting an Attic repository to Borg and also
helps with converting Borg 0.xx to 1.0.
.sp
Currently, only LOCAL repositories can be upgraded (issue #465).
.sp
Please note that \fBborg create\fP (since 1.0.0) uses bigger chunks by
default than old borg or attic did, so the new chunks won\(aqt deduplicate
with the old chunks in the upgraded repository.
See \fB\-\-chunker\-params\fP option of \fBborg create\fP and \fBborg recreate\fP\&.
.sp
\fBborg upgrade\fP will change the magic strings in the repository\(aqs
segments to match the new Borg magic strings. The key files found in
$ATTIC_KEYS_DIR or ~/.attic/keys/ will also be converted and
copied to $BORG_KEYS_DIR or ~/.config/borg/keys.
.sp
The cache files are converted, from $ATTIC_CACHE_DIR or
~/.cache/attic to $BORG_CACHE_DIR or ~/.cache/borg, but the
cache layout between Borg and Attic changed, so it is possible
the first backup after the conversion takes longer than expected
due to the cache re\-sync.
.sp
Upgrade should be able to resume if interrupted, although it
will still iterate over all segments. If you want to start
from scratch, use \fBborg delete\fP over the copied repository to
make sure the cache files are also removed:
.INDENT 0.0
.INDENT 3.5
.sp
.EX
borg delete borg
.EE
.UNINDENT
.UNINDENT
.sp
Unless \fB\-\-inplace\fP is specified, the upgrade process first creates a backup
copy of the repository, in REPOSITORY.before\-upgrade\-DATETIME, using hardlinks.
This requires that the repository and its parent directory reside on same
filesystem so the hardlink copy can work.
This takes longer than in place upgrades, but is much safer and gives
progress information (as opposed to \fBcp \-al\fP). Once you are satisfied
with the conversion, you can safely destroy the backup copy.
.sp
WARNING: Running the upgrade in place will make the current
copy unusable with older version, with no way of going back
to previous versions. This can PERMANENTLY DAMAGE YOUR
REPOSITORY!  Attic CAN NOT READ BORG REPOSITORIES, as the
magic strings have changed. You have been warned.
.SH OPTIONS
.sp
See \fIborg\-common(1)\fP for common options of Borg commands.
.SS arguments
.INDENT 0.0
.TP
.B REPOSITORY
path to the repository to be upgraded
.UNINDENT
.SS options
.INDENT 0.0
.TP
.B  \-n\fP,\fB  \-\-dry\-run
do not change repository
.TP
.B  \-\-inplace
rewrite repository in place, with no chance of going back to older versions of the repository.
.TP
.B  \-\-force
Force upgrade
.TP
.B  \-\-tam
Enable manifest authentication (in key and cache) (Borg 1.0.9 and later).
.TP
.B  \-\-check\-tam
check manifest authentication (in key and cache).
.TP
.B  \-\-disable\-tam
Disable manifest authentication (in key and cache).
.TP
.B  \-\-check\-archives\-tam
check TAM authentication for all archives.
.TP
.B  \-\-archives\-tam
add TAM authentication for all archives.
.UNINDENT
.SH EXAMPLES
.INDENT 0.0
.INDENT 3.5
.sp
.EX
# Upgrade the borg repository to the most recent version.
$ borg upgrade \-v /path/to/repo
making a hardlink copy in /path/to/repo.before\-upgrade\-2016\-02\-15\-20:51:55
opening attic repository with borg and converting
no key file found for repository
converting repo index /path/to/repo/index.0
converting 1 segments...
converting borg 0.xx to borg current
no key file found for repository
.EE
.UNINDENT
.UNINDENT
.SS Upgrading a passphrase\-encrypted Attic repo
.sp
Attic offered a \(dqpassphrase\(dq encryption mode, but this was removed in Borg 1.0
and replaced by the \(dqrepokey\(dq mode (which stores the passphrase\-protected
encryption key in the repository config).
.sp
Thus, to upgrade a \(dqpassphrase\(dq Attic repo to a \(dqrepokey\(dq Borg repo, two steps
are needed, in this order:
.INDENT 0.0
.IP \(bu 2
borg upgrade repo
.IP \(bu 2
borg key migrate\-to\-repokey repo
.UNINDENT
.SH SEE ALSO
.sp
\fIborg\-common(1)\fP
.SH AUTHOR
The Borg Collective
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