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logging in as root over rsync/ssh for backups

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http://www.linuxquestions.org – I need to login as root, or at least get root privileges, in a cron triggered backup run. The straight way to do this would be the backup server making an ssh connection to the server to be backed up (this way because I want to avoid many servers being backed up in parallel and the backup server itself would be managing this diversity), via the rsync command which would be performing the backup's synchronization step. I'm looking for alternatives to this in some form. I'd like to disallow direct root login to my ssh port (not 22). One idea I have is to have the backup server initiate an ss (HowTos)