With everything selected that is available, all features and all Virtualmin settings, this is what I get after waiting almost an hour to it to download/read the S3 backup I'm pointing to....
Are you sure you want to restore the selected domains and features from Amazon S3 bucket ns1-kmeathosting_08_06_2017? Any existing data for the features in these domains will be over-written!
Warning - the following features were enabled in one or more of the domains in the backup, but are not enabled on this system : Plugin virtualmin-dav, Plugin virtualmin-mailman, Plugin virtualmin-svn, Plugin virtualmin-signup, Plugin virtualmin-google-analytics
Without them, some functions of the restored virtual servers may not work.
This backup cannot be restored due to the following errors : Reseller tdb does not exist