[Question] ReadyNAS 6.6.0 and Amazon Cloud Drive backup share

I just recently upgraded my RN202 to 6.6.0 and I saw in release notes the first item under 'Improvements' is "Amazon Cloud Drive backup share is now optional."

I'm curious how this works.  Before updating to the new version I setup my Amazon Cloud backup with a brand new Cloud Drive account, so I don't have the problem that some others have had of having all their content from Amazon pulled down to their NAS.  But I'm also not able to uncheck the 'Enable' checkbox under the 'Sync with Amazon Cloud Drive' settings for the AmazonCloudDrive share and I don't see any additional options that were not present on 6.5.x.

I don't know if this matters or not but I am currently sycning up about couple hundred GBs.  I guess I'm just not clear on exactly what that item in the release notes is referring to.  Additionally I've noticed that the upload is kinda slow.  This is not a problem for me since it's backup but it does make me curious if the device does any network throttling when making these backups to ensure that regular usage of the NAS isn't impacted.  The job has been going for about 9 hours now and has copied maybe 40GB of data.