We built rclone into our environment and started explicitly supporting it in 2018 but we now have a nice, easy to understand rclone HOWTO that is appropriate for ANY user of rclone, not just an rsync.net customer:
It gives an overview of how rclone is used and what the general setup flow is and then gives a long, detailed, step by step HOWTO for a sample S3 to rsync.net integration.
Again, this could be used by anyone and is not specific to rsync.net customers.
I would also like to thank @ncw for implementing the "long, complex command line options" that we have also referred to in the HOWTO - it is very nice to be able to configure a remote with a specific (long) command line and skip the interactive setup:
ssh email@example.com rclone config create s3remote s3 [provider AWS] [env_auth false] [s3-region us-east-1] [acl private]