Configure a remote. For example, here are the instructions for a WebDAV remote, which is needed to configure CloudStor: https://rclone.org/webdav/. In our case it was configured using environment variables, where AARNET is the customised name given to this remote connection.
In this command --transfers is used and set to perform 36 concurrent transfers from source-dir to dest-dir on the remote AARNET location.
The --checkers option is used to increase the number of tasks that are checking to see if the file already exists on the remote. It should be greater than transfers to make sure that transfers is kept at capacity.
The --checksum option is used to skip files if they already exist based on checksum, not mod-time and size.
You can tweak the number of transfers based on the files that are being copied, but be aware that you will hit a limit.