[CentOS] rsync and users

Thanks to the encouragement of some people on this list, I am using 
rsync to synchronize two servers: one is a backup to the other in case 
the primary one fails.  By hand, I inserted the names of the users on 
the primary server into the backup server.  So, now all works well.

/usr/bin/rsync -av -e ssh /home/ 192.168.0.22:/home/

My question is what would happen if the users were not on the backup server?

Is there anyway to have the users automatically inserted into passwd and 
group?

Todd

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