If you used to have minio as a part of your local development/testing setup to mock the S3 API, look at RustFS ( https://rustfs.com/ ).

It can scale to large sizes, but it can also scale _down_. At minimum, it's a small binary that you can just put into your podman-compose file, set the static API keys (RUSTFS_ACCESS_KEY/RUSTFS_SECRET_KEY) and use from your local app. It even has a nice web console to look around the storage.