restic/changelog/0.14.0_2022-08-25/issue-21

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Enhancement: Add compression support
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We've added compression support to the restic repository format. To create a
repository using the new format run `init --repository-version 2`. Please note
that the repository cannot be read by restic versions prior to 0.14.0.
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You can configure whether data is compressed with the option `--compression`. It
can be set to `auto` (the default, which will compress very fast), `max` (which
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will trade backup speed and CPU usage for better compression), or `off` (which
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disables compression). Each setting is only applied for the current run of restic
and does *not* apply to future runs. The option can also be set via the
environment variable `RESTIC_COMPRESSION`.
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To upgrade in place run `migrate upgrade_repo_v2` followed by `prune`. See the
documentation for more details. The migration checks the repository integrity
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and upgrades the repository format, but will not change any data. Afterwards,
prune will rewrite the metadata to make use of compression.
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As an alternative you can use the `copy` command to migrate snapshots; First
create a new repository using
`init --repository-version 2 --copy-chunker-params --repo2 path/to/old/repo`,
and then use the `copy` command to copy all snapshots to the new repository.
https://github.com/restic/restic/issues/21
https://github.com/restic/restic/issues/3779
https://github.com/restic/restic/pull/3666
https://github.com/restic/restic/pull/3704
https://github.com/restic/restic/pull/3733