MinIO is a great web browser tool to use with Backblaze B2.

Recently, I found the latest MinIO does not support B2 due to eTags. So, a previous version needed to be used.

Here's the info in github.

S3 gateway - Backblaze b2 · Issue #11172 · minio/minio
Is the S3 gateway mode currently broken with backblaze B2? Expected Behavior Upload/Download Files Current Behavior Files upload, but downloading doesn't seem to work, Nextcloud returns 0 byte ...
Release Minor Bug Fix Release · minio/minio
Highlights Healing fixes and improvements. See (#11098, #11097) for more details.fix: do not return nosuchversion error in deleteobjects API. See (#11114) for more details.Improvements to ILM. S...

Backblaze's Directions

b2 copy-file-by-id <sourceFileID> <destinationBucketName> <b2FileName>

Here's my docker-compose.yaml

version: '3'

    image: minio/minio:RELEASE.2020-12-16T05-05-17Z
      - "9000:9000"
      MINIO_ACCESS_KEY: [B2 Key]
      MINIO_SECRET_KEY: [B2 Secret]
    command: gateway s3