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[[!tag announcement obnam]]
[[!meta date="Sun, 24 Jul 2022 12:32:51 +0300"]]
[[!meta title="Obnam 0.8.0 - encrypting backup program"]]
I've just pushed out version 0.8.0 of [Obnam](https://obnam.org/), an
encrypting backup program. Below are the release notes.
# Version 0.8.0, released 2022-07-24
## Breaking changes
Breaking changes are ones that mean existing backups can't be
restored, or new backups can't be created.
* The list of backups is stored in a special "root chunk". This means
backups are explicitly ordered. This also paves way for a future
feature to backups: only the root chunk will need to be updated.
Without a root chunk, the backups formed a linked list, and deleting
from the middle of the list would updating the whole list.
* The server chunk metadata field `sha256` is now called `label`.
Labels include a type prefix, to allow for other chunk checksum
types in the future.
* The server API is now explicitly versioned, to allow future changes
to cause less breakage.
## New features
* Users can now choose the backup schema version for new backups. A
repository can have backups with different schemas, and any existing
backup can be restored. The schema version only applies to new
backups.
* New command `obnam inspect` shows metadata about a backup. Currently
only the schema version is shown.
* New command `obnam list-backup-versions` shows all the backup schema
versions that this version of Obnam supports.
* Obnam now logs some basic performance measurement for each run: how
many live files were found in total, backed up, chunks uploaded,
existing chunks reused, and how long various parts of the process
took.
## Other changes
* The `obnam show-generation` command now outputs data in the JSON
format. The output now includes data about the generation's SQLite
database size.
## Thank you
Several people have helped with this release, with changes or
feedback.
* Alexander Batischev
* Lars Wirzenius
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