### Verify auto-encryption

> Note that auto-encryption only affects requests without S3 encryption headers. So, if a S3 client sends
> e.g. SSE-C headers, MinIO will encrypt the object with the key sent by the client and won't reach out to
> the configured KMS.

To verify auto-encryption, use the following `mc` command:

```
mc cp test.file myminio/bucket/

> Is this change backward compatible? Will it break my setup?

This change is not backward compatible for all setups. In particular, the native
Hashicorp Vault integration - which has been deprecated already - won't be
supported anymore. KES is now mandatory if a third-party KMS should be used.

Further, since the configuration data is encrypted with the KMS, the KMS
configuration itself can no longer be stored in the MinIO config file and

> **NOTE:** `{1...n}` shown have 3 dots! Using only 2 dots `{1..n}` will be interpreted by your shell and won't be passed to MinIO server, affecting the erasure coding order, which would impact performance and high availability. **Always use ellipses syntax `{1...n}` (3 dots!) for optimal erasure-code distribution**