How do you backup a folder to Backblaze B2?

General
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I’m using a docker container. I want to backup to a Backblaze B2 bucket.
I’ve created the Backblaze bucket.
I’ve created a Kopia repository that points to the Backblaze bucket.

Next…

How do I backup a docker non-container folder to the repository (Backblaze B2)?
The container doesn’t seem to have a path to the host folder that I want to backup.

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