Kopia v0.9.0-rc1 is released

I’m happy to announce that first release candidate of Kopia v0.9 is finally out. It’s a big release, with lots of internal changes and some major performance improvements.

Read the release notes and download from here:

Upgrade instructions are here: Upgrade | Kopia


Some questions about the format change that I didn’t see documented anywhere.

Will this be something that migrate things slowly over time or will it require me to download and re-upload data? If it is the latter, how does it handle if the operation is aborted early (connection drops, OOM, etc)?

Upgrade is a relatively simple operation and only updates indexes which are usually small. Upgrade is also atomic - it rewrites kopia.repository blob to indicate new version is to be used.

There are no upgrade doc on the website yet, in the meantime please use this:

To upgrade repository:

  1. Disconnect all but one kopia clients for upgrade:
  • using CLI, kopia repository disconnect
  • using KopiaUI, click Repository | Disconnect.

This is super important, failure to do so may corrupt repository*

  1. Upgrade all kopia executables to >=v0.9.0-rc1

  2. Using connected kopia, run:

$ kopia repository set-parameters --upgrade
  1. Verify upgrade by:
$ kopia repository status

You should see Format version: 2

  1. Reconnect kopia clients that were disconnected in step 1

After upgrade all new v0.9 features will be supported except password change. At this point kopia v0.8 will fail to open the repository.


Very exciting times! Thank you for all the hard work on this RC! I look forward to upgrade all repos.

About 2 month passed since [TESTERS NEEDED] Major improvements to repository index format

Thank you very much for your hard work and time spend! :clap: