It is fast and easy to setup S3 Immutability when leveraging Wasabi and Kasten.

First login to your Wasabi account. Create a user for the API and an Access key:

Next Create a new bucket making sure to turn on Object Lock

Now create a new Location profile in Kasten

You will need to validate the bucket in Kasten:

Next create a backup and point it at the Wasabi location profile:

Just like that we have a successful immutable backup: